Malicious PDF — malware analysis report

Static analysis result for SHA-256 62bc90a5743fca95…

MALICIOUS

PDF

78.9 KB Created: 2021-05-05 12:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfabf10cd3f5cdadfe5fbe5c6201f779 SHA-1: e35445416f7805940090f0bfcd2128269bece6f5 SHA-256: 62bc90a5743fca95371572c7f69ef1fcec2a65a6fd94e91a4262d1279880f3af
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO link farms and phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, and the ClamAV detection as Pdf.Phishing.Trojan suggests malicious intent. The document body, though heavily obfuscated, contains text related to a phone hard reset, likely a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=lg+l90+hard+reset
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5fcc71421056a.pdf
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fe985072f59f.pdf
    • https://cdn-cms.f-static.net/uploads/4380073/normal_600fcf0a64c16.pdf
    • https://cdn-cms.f-static.net/uploads/4496391/normal_5fd970d6e6353.pdf
    • https://cdn.sqhk.co/vasegodesazu/gjhgidO/spacex_launch_starlink.pdf
    • https://cdn-cms.f-static.net/uploads/4367645/normal_6014882f0228e.pdf
    • https://cdn-cms.f-static.net/uploads/4389095/normal_603061d3073ba.pdf
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5ff44b187eee4.pdf
    • https://cdn-cms.f-static.net/uploads/4369316/normal_6030d910eb814.pdf
    • https://cdn.sqhk.co/suxujaba/zhhibIR/71558418568.pdf
    • https://cdn.sqhk.co/wovupeni/BKaAhbj/41946512763.pdf
    • https://cdn.sqhk.co/tijatabov/egcdNgg/84901924215.pdf
    • https://static.s123-cdn-static.com/uploads/4446019/normal_5ff9cb506a333.pdf
    • https://cdn-cms.f-static.net/uploads/4459785/normal_5fd290a9e8c05.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_3df1f98abab94ed08b239208777fcede.pdf?index=true
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_40f99000ac6f4e45810bce06bc714983.pdf?index=true
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_4cdb04efc29d4799aa1fb1b3bb9d438c.pdf?index=true
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_69d46a4baf43442b826bd26c3f6a803b.pdf?index=true
    • https://21036261-01f9-4725-a342-2b8b08d10099.filesusr.com/ugd/d0cbc4_e52b6c4bf72c4cd5bbee959739309e21.pdf?index=true
    • https://f3e0ee59-b309-4736-aefa-1db4f942b0be.filesusr.com/ugd/e87662_50c301ae7e1c4617aff128a33ffc1cda.pdf?index=true
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_df25eaca23d7484aae383553c83a5ffd.pdf?index=true
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_3332856d051e4a53aa46b4ff6715318f.pdf?index=true
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_852e841bf4d040c1a2bffb633efd2cb3.pdf?index=true
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_65a5ea9c8a634ce09e501aa2fbaa0fff.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_79d5f8635c724442b5b8c33b8bfb0319.pdf?index=true
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_709d97a1deb24b76a68d2757bee944de.pdf?index=true
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_cbc6d4f38e674778ad4fb2cb86672200.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f362.bin
00e769e378e06307d4f41caa51525d62430e227e5a22cbd0f4fd2e2ed9a673c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 5324 bytes
font_01_sfnt_off00010576.bin
8e1e97e4f37484cbb3f00d829fb5cd1841a6829507d745f7e6f71b44d9817a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 11572 bytes

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