Malicious PDF — malware analysis report

Static analysis result for SHA-256 435aa65993479cc8…

MALICIOUS

PDF

79.8 KB Created: 2020-11-11 20:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b4eaea0b3185b028c9cee3c0d500bd07 SHA-1: dcd5047298d450ecefb13cf164e9c1d587f18274 SHA-256: 435aa65993479cc821e239cca9cc36767150c0b230f30af876fb84013d446844
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffset.ru/aws?utm_term=beyond+good+and+evil+ps3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f95693145467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_5f93e92ba8951.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/e20ade95cf.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/7e80ea1ac1c2f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5f89ac91b343b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5f9b03755a47a.pdfIn PDF document text
    • https://selubigal.weebly.com/uploads/1/3/4/5/134518702/kevolob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_5f9ed31ea0943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5f96bfc70fc24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zirojopemup/best_pathophysiology_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/biome_bundle_1.12.2_forge.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/list_of_common_objections_used_in_court.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/double_deck_pinochle_rules_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/contents_of_the_dead_mans_pockets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 5116 bytes
SHA-256: d0b4f2724033c0948b2f1a2728442cdc2e4cdbc68b3582a117308fb6c1efee73
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 11056 bytes
SHA-256: 99e5c05dc54781e621ebc0cdbb93fda081fff5e99e8d2844d82cac48f4dfe854
font_02_sfnt_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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