Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fb8addf2771eb3…

MALICIOUS

PDF

86.6 KB Created: 2021-03-09 11:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 016c6207f0b6aced62460988cf2717f6 SHA-1: 2278d9dd777a2c6189cb98458f901ad7c48255d0 SHA-256: 52fb8addf2771eb38a2d075f40ce63f5bd2ffcbcd33af4bfbf0e1ffb8ad4973b
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded URLs that lead to suspicious domains, including one identified as a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to a lease assignment form, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=assignment+of+lease+to+new+owner+form PDF link annotation
    • http://fagumawegoleleb.mypressonline.com/81717690560.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/jgicTVX/picture_quiz_with_separate_answers_uk.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/87533983425.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/9629667483.pdfIn PDF document text
    • http://lagidonak.mygamesonline.org/jilodapam.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/ZPfWGco/earthbound_switch_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/sobetevod/cuc6B3v/planet_pizza_shelton_coupons.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/lowawerivilawanum.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/munatunetejipoxared.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_cf29bdbc99e24fdfa71bb4e24cc9d3e3.pdf?index=trueIn PDF document text
    • http://suzufesa.epizy.com/jinuzawatonipilobuseg.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_0ab7e60df58645f89d7a6b077d3ed3a0.pdf?index=trueIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/40443146173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073be52c-7b37-407f-a3a7-1628d12e838c/97832863745.pdfIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_5deaab2fea024acfa34da61fce25678b.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_e9266428d9914ee09d7788881ca1eca9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a587227-8efc-42e3-9d13-28663fdb736f/wizinubonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1788ff-8881-4afc-b423-d9a79badc13a/77202218575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5e9297-a77d-4d83-9faf-fa815a0902ba/jenn_air_oven_repair_manual.pdfIn PDF document text
    • http://megoger.rf.gd/62480710997.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 5168 bytes
SHA-256: 368bf196600cdb4c1e36340e4ba550929d7ddbabfc4231c5e6dcc82bded55308
font_01_sfnt_off000126db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DB 11184 bytes
SHA-256: 88da35cc8cc3aa95e72b93ea45ad9b82c87db4bc88337ce3920d14d19cc1def9

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