Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ebb7551ee71254…

MALICIOUS

PDF

74.2 KB Created: 2021-03-13 20:16:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1ed53d185122d86670c2ccf1d53e68ab SHA-1: 9c1f0b463c6659f3e20bd3fdb27ab3ad2cef1cd4 SHA-256: 79ebb7551ee71254bead47fdaf0cf4cd7d4c26e49e1b3df798656573ad78da18
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/wix?keyword=rapunzel%2527s+revenge+pdf+download PDF link annotation
    • https://xoburorabusu.weebly.com/uploads/1/3/0/7/130738623/vewumunemolubujuj.pdfIn PDF document text
    • http://rewita.fun/zejuxutexidibejesededwv3s8.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/f681ccf45ba1a.pdfIn PDF document text
    • http://uscarins.info/92209887733jw718.pdfIn PDF document text
    • https://gopadafuwidu.weebly.com/uploads/1/3/0/7/130740623/d494bf67160b.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/epgdV6v/skylands_medical_group_andover_nj.pdfIn PDF document text
    • http://olipaka.xyz/printable_dinosaur_coloring_pages_pdo7o89.pdfIn PDF document text
    • http://hytri.com/99183237553k43k2.pdfIn PDF document text
    • http://changely.club/rusugewejefekironuwuxeznr.pdfIn PDF document text
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/6120178.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/mipuwoxubu_pufejuvixuw_fivaxasaji_kinerovetoza.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/defawosodinupasjf6rv.pdfIn PDF document text
    • http://summerita.fun/mudukojonemejelo31o8.pdfIn PDF document text
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/9df52.pdfIn PDF document text
    • http://blacklaser.ru/python_language_basics_booklugif.pdfIn PDF document text
    • http://mesretly.xyz/799905926659ob2t.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/Kichaie/99982970624.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/ageQ2gi/hitman_sniper_assassin_free_download.pdfIn PDF document text
    • http://prizinsta365.online/somivawilafa57i8s.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/2264690.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_b204f90be9ec431896c689f0fb83ad1a.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_1b2d1b03787843e6811d56775bebd919.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_d432b86f95b84538b29c80fa15e9af87.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_9bc78b5b3b764ed88f250bc7c0bff459.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_e3ea234866e94e1381458eb344b7449e.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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 5452 bytes
SHA-256: fd029856b002b48640c9ebad00f8c33d7862f0a8d39d1608ac6875b70b7048fa
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 10480 bytes
SHA-256: a6cb6b7562cd6c770c833b4041f1b0a9b674885982e3010ff06e189c6adc1189