Malicious PDF — malware analysis report

Static analysis result for SHA-256 79821b4ccef154ee…

MALICIOUS

PDF

73.1 KB Created: 2021-03-10 18:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8d52a6aef7cdc8712275db9522c7535c SHA-1: cfd0ed3bafbd9cf4f2ff4c513d20e77dde09032e SHA-256: 79821b4ccef154eef54118e55c58e2c6c91c17a17f5fde8fc06e890e45aba281
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily garbled, references 'Fallout 4' and 'survival guide', likely a lure to disguise the malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/wix?keyword=fallout+4+-+vault+dweller%2527s+survival+guide+-+das+offizielle+l%25C3%25B6sungsbuch+pdf PDF link annotation
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/9ad26946c4c.pdfIn PDF document text
    • https://cdn.sqhk.co/digijodaga/YZjaias/facebook_business_manager_id.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/idggOJv/15830757837.pdfIn PDF document text
    • https://nezuwiwobitedut.weebly.com/uploads/1/3/4/6/134600585/wuvugijavus.pdfIn PDF document text
    • https://jidobatixinel.weebly.com/uploads/1/3/4/7/134726111/a77843505130.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/2920718.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/jcidMwb/download_fruit_fancy_mod_apk.pdfIn PDF document text
    • https://wadenipix.weebly.com/uploads/1/3/1/4/131408068/tijawiri-nololurozomured.pdfIn PDF document text
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/xopofovisop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_dada5c576df34db3a0382bb5b7ae7440.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74db605-f112-4a93-8da9-a27c734cb549/kepusapi.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/30460690905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e604307-0a5b-4567-b2ab-c15ab85587f8/kigigerokufiwabisud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0826ab-2f3d-4476-aab0-ea3f9cc5953e/dungeons_and_dragons_2_full_movie_online_free.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_067729eb92e84895a41206655a8744ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/alchemy_game_for_mac.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_4b1224efe34e4d468e6089da4d983859.pdf?index=trueIn 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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 6008 bytes
SHA-256: 942c7deefea27899d9d8db2edc1a3c227dc33baf1f4a298e825804569099bf7b
font_01_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 11440 bytes
SHA-256: 206de442ade466383c9480eb38a021f9350eab31b3ef07bd6bb9dcd187a16078

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