Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17456f262a54f70…

MALICIOUS

PDF

70.8 KB Created: 2021-03-09 15:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e37dfa8c0b14fc80ba20694898a41c4 SHA-1: 623e0ddbc49050502868a0d0b67d40a0025f5805 SHA-256: a17456f262a54f707874c436a5b8df1b5a66dccb197a875da745f9e25541dd5e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=the+intimate+act+of+choreography+pdf PDF link annotation
    • http://zokazurimila.mygamesonline.org/is_a_mustang_reliable.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/mjbmBjd/beruxirorivitilireviriti.pdfIn PDF document text
    • http://evromotors.net/difficult_word_search_online_free0vj1k.pdfIn PDF document text
    • http://tututot.mygamesonline.org/61693419769.pdfIn PDF document text
    • http://wtia.space/lamuruvejumafedafemopz1ffs.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/haCrovd/ganakemofaxopinifukoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lasedunagikosu.rf.gd/arrl_handbook_2021_softcover.pdfIn PDF document text
    • http://difugarulid.epizy.com/vowixurupaporokexuvavufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf9b636-5bff-4934-9759-44ab66b50803/exhibition_proposal_letter_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d22cf26-fc72-431e-b13f-a916bbcbee09/brother_ce4000_bobbin.pdfIn PDF document text
    • http://dipibezepipes.rf.gd/16783341118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765f6ec2-a17d-4b74-873b-4033353516ce/pilinepitugamafeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d901b24-4396-44ff-b4ed-77d3e453628b/str_dn850_app.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/jogakakizemegil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b312cc-fb7a-4869-9ade-8083e0c1b7c7/61878529496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6889514-1e9d-4913-a591-01db58f05f81/2007_sportster_883_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071c2153-6642-4b62-be2f-ada5c8f089e8/citizen_gn-4w-s_band.pdfIn PDF document text
    • http://jojisoxig.epizy.com/excel_bedingte_formatierung_mehrere_bedingungen.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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 5412 bytes
SHA-256: 09848417a9ceb1e5ef7f168f3666375e0326fc680cf8cd171ac242b047c1f08d
font_01_sfnt_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 10008 bytes
SHA-256: 87521ab3986132ab61d0463423652c83a554651ec97cb764290d86843ecddb00

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