Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3acaf26f391ffb…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 22:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 602dd17880b8a2f4ed5be54f5f2d09af SHA-1: 0f0c481f80ad899a2e7c0974cc33548927780268 SHA-256: 0f3acaf26f391ffb1af2061f8a193e6d01a2d1bf52e8cbbad0cb4d4603b5bf1a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO abuse tactic to drive traffic to malicious sites. The document body, though heavily obfuscated, appears to be related to search queries, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=what+does+bible+say+about+marriage+after+divorce PDF link annotation
    • https://cdn.sqhk.co/wuvupalib/1hfPhbP/carrie_underwood_concert_2019_song_list.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/sample_business_proposal_in_ethiopia.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/CjcJLjg/42278502657.pdfIn PDF document text
    • http://neyroskakalka.site/how_did_wu_tang_members_get_their_names325sy.pdfIn PDF document text
    • http://abreudesigns.com/64496008421m3oo.pdfIn PDF document text
    • http://dronextactical.xyz/who_became_the_first_recorded_staff_non-commissioned_officer_in_marine_corps_historynpzfe.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/california_adventure_map_2020.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/didarazodepasubaxuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/YggKbnr/5726155899.pdfIn PDF document text
    • http://paxabak.mypressonline.com/adjectives_with_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/FS4ijgh/fast_food_restaurants_next_to_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/hPMyPhb/83832486406.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/ibibQja/typewise_keyboard_big_keys_privacy_swipe.pdfIn PDF document text
    • http://axecheat7.xyz/the_shack_restaurant_cherry_grove_beach_scz8c5v.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/jbtgdfH/yellow_jacket_nest_in_wall.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/ljjxqTY/free_open_world_building_games_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/jdhbjhy/suppository_for_babies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/ninasunebikalo.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_8798707407f147b780dfbf0e73348537.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_e1fe4edd10544f29bf41a1647a834388.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_e789466a5bcd41b19fe96087a44781ab.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_7c5a707ac05d42a0af927ed762bf5b83.pdf?index=trueIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_cf856f02a81c4bd99d982b95559ecc54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/28471195105.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_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 5748 bytes
SHA-256: b296d10723119ef5ceb98250dd7f29bbfd7d5ef91acd54accf898997cfb1400d
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10616 bytes
SHA-256: 327a929eb0bfd0744f590e6090523401ae720551067afc8627029040c42a9be5