Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5db8822a0f4fa1…

MALICIOUS

PDF

150.0 KB Created: 2021-05-13 00:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f0f7e404271266e2a6c0565fa7773aa9 SHA-1: 798b860e673229bef3a1b4c05d4a2a83a630de1b SHA-256: ae5db8822a0f4fa166ffc177184a9ac3991b4d86779a1d70bd6de2aeba4af729
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing lure, possibly related to the book title found in the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9570

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=the+darkest+minds+book+3+liam+and+ruby PDF link annotation
    • http://kyhni.site/56668750027sxit5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_602813a53d58f.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/tilumawuzofiweloketlugoe.pdfIn PDF document text
    • http://keto-menu.online/how_do_you_sing_in_spanish6x57z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485569/normal_5ff47cab6db15.pdfIn PDF document text
    • http://golomashvanna.xyz/mugevufuf97bp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_6006bee8cf08a.pdfIn PDF document text
    • https://folenepawesig.weebly.com/uploads/1/3/2/6/132680852/9700441.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/e16d28067ccbb.pdfIn PDF document text
    • http://deromgroup.com/50194635615q24sb.pdfIn PDF document text
    • http://eurosett.net/what_states_offer_paid_parental_leavek5cde.pdfIn PDF document text
    • http://freshmind.net/ip_man_3_parents_guidel6u7e.pdfIn PDF document text
    • http://connexion-amelii.xyz/addictive_drugsvuoc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_60268af44f9b2.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/lafekiger.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7e1dd1-3be7-44a2-83f3-43dd22dccca1/14342380697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41fdcf3-b161-44bf-8b9c-2f8fc969ff7a/how_to_descale_the_keurig_2.0_with_vinegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fc9ccf-c8fd-4aab-9a01-0500544daca4/76532965525.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_011_off0002325d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2325D 7768 bytes
SHA-256: 645efa6a792676154cfcedd8d4ecf3e0e519d34426c47baee101bc5721a0e550
font_00_sfnt_off00015c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C38 18152 bytes
SHA-256: feb77067a884d6ba7993bfded30f34d8d154337e6ab576506817b9cfb13171aa
font_01_sfnt_off0001902a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1902A 3540 bytes
SHA-256: 86068b911a5be0fb2d2d52b098de6a1a95ea77b2967d430a2f10d2a24cc8a6cc
font_02_sfnt_off00019ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CCF 5484 bytes
SHA-256: 872ac4ac3d3c208d9d601dc5f7f6e13ffb57f97187364e72ba20fae96a904496
font_03_sfnt_off0001af48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF48 9016 bytes
SHA-256: 02845fd97178d174420fa57ce4ff70d3e2391d3d873e81f53d20c69b144b9226
font_04_sfnt_off0001c17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C17C 2688 bytes
SHA-256: a0e8df56483088873aa420484512338a08d14c672fff6261be71a78ef898be1f
font_05_sfnt_off0001cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBD0 3720 bytes
SHA-256: 7b3873e589c85a68e374569398d2ffe9c9de98f2310bb10cc3923f5e66930960
font_06_sfnt_off0001d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D709 2320 bytes
SHA-256: 9955be659735df9034fd00ad9d64280f6503b6a02db8edde50d175952318a6df
font_07_sfnt_off0001e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E17A 13760 bytes
SHA-256: a92a09ee64300b2db0639472892fd2345f14b536566046abda8ef61bcce5dd84
font_08_sfnt_off00020fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FED 19904 bytes
SHA-256: b962cb93b29200731dae1c02bc530dc2331a8603709e8ea59c63977befb644d6

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