Malicious PDF — malware analysis report

Static analysis result for SHA-256 8347c7256b33c286…

MALICIOUS

PDF

76.6 KB Created: 2021-04-01 02:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8dc4cd4142cfa63c77d831b01acea73 SHA-1: e2822f3f6c1e088b3c73689f2ff66a74ddf997f6 SHA-256: 8347c7256b33c2862c35fe89b9b441389d266957ce7b1e2bddcff7e0e05d04b8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' containing 30 external links. One of these links, 'https://xezojetit.ru/wix?keyword=lenny+von+dohlen+young', is directly embedded and likely leads to a phishing or malware distribution site. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of embedded links and the ML classifier's high confidence score indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=lenny+von+dohlen+young
    • http://sesalon.xyz/chrisette_michele_songs_freekcv4x.pdf
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdf
    • http://naturalik.fun/turbo_aow_engine_freees0yy.pdf
    • https://cdn.sqhk.co/wovupeni/Mjchcgc/72396125197.pdf
    • https://cdn.sqhk.co/mubogasaven/DZLYhfC/99769802341.pdf
    • https://cdn.sqhk.co/liminekaj/jjSEifm/paxobonizexunafukevanegaw.pdf
    • https://cdn.sqhk.co/nigulavax/QicQzib/kowumive.pdf
    • https://cdn.sqhk.co/fajoliteve/SGifU7r/sasovep.pdf
    • https://gomopurijovovuj.weebly.com/uploads/1/3/5/3/135390772/5597591.pdf
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdf
    • https://cdn.sqhk.co/futevanu/igcjeWX/hitman_games_ranked.pdf
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/xubovewuvipo.pdf
    • http://davavemoj.66ghz.com/friend_like_me_piano_sheet.pdf
    • https://cdn.sqhk.co/rojarasam/zqiBZhj/the_rental_killer_actor.pdf
    • https://cdn.sqhk.co/zoxojuvef/C35jfpb/mirukirunolup.pdf
    • https://cdn.sqhk.co/rifusofuwedi/ihijahh/poraler.pdf
    • https://cdn.sqhk.co/wadusazilox/hdbMo2P/83984219159.pdf
    • http://rebelliona.online/safety_insurance_group_claims_phone_numberk7kjo.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lofuwup.rf.gd/keremugemujajewebabed.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24c.bin
6b09bcba361c42043f4f8e9abbed93eb63bef5ed23ff1acf7a21a57f5889060d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 4460 bytes
font_01_sfnt_off0000f173.bin
dd066f5d8ade75c759856520254116f2d357b6b19ecc85f7fe5b761dd776ae5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 11252 bytes
font_02_sfnt_off00011769.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 4324 bytes

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