Malicious PDF — malware analysis report

Static analysis result for SHA-256 3112779bf085ab14…

MALICIOUS

PDF

81.4 KB Created: 2021-05-25 19:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01726c260d302d791a8a1c222c6339eb SHA-1: 570eab7697ecb32bb33e134a3730bd9c1e7de352 SHA-256: 3112779bf085ab1436eef9bcb8d72055072aefb97feabef48569b80fb38cc3f5
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=sunding+sd+563+c+manuale+italiano PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393345/normal_60158196bdc09.pdfIn PDF document text
    • https://jexadafiveti.weebly.com/uploads/1/3/4/7/134765621/044704c6f6.pdfIn PDF document text
    • https://wovanawobudiw.weebly.com/uploads/1/3/5/3/135332940/lawiledof.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/2783079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_60683a3a5116f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_60620c2a2ef38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421934/normal_5feb99f05f556.pdfIn PDF document text
    • https://dunexekexafu.weebly.com/uploads/1/3/4/6/134622254/6549284.pdfIn PDF document text
    • https://bukudemedu.weebly.com/uploads/1/3/1/4/131483547/kebonufodo-fexufijujez-nosapodapidovem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_602c474bcebfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490375/normal_6030e78fd4501.pdfIn PDF document text
    • https://mumevifovamix.weebly.com/uploads/1/3/4/4/134486033/xidiwaxelu.pdfIn PDF document text
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/5252740.pdfIn PDF document text
    • https://wipegozi.weebly.com/uploads/1/3/0/9/130969535/2f311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_601ba58de4541.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/acfedb6f.pdfIn PDF document text
    • https://bexunofa.weebly.com/uploads/1/3/4/7/134721512/223d2650a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d2b851-62be-4354-8440-2a67e009c806/cateye_mity_8_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/cloudformation_template_to_create_application_load_balancer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8682dd-6619-4fb6-98a0-d97565351b1d/why_is_my_second_monitor_not_detected_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/farberware_coffee_maker_5_cup_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/10823943228.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/rowisitusemop.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/19747585288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7079ad9c-efa2-41f4-8bb1-bcd76f71b993/68267934837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66df7f85-7a5d-4853-bbf5-20f49c509062/37979531365.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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 5708 bytes
SHA-256: f3c8ba68a4763649f4802498955cd03fed42ed94b69ca0655b1152dda52932c2
font_01_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 17412 bytes
SHA-256: e47de8e038e5f8040e543f8ee401aa4c0803e4535bf4aa2148bf63668d878cc6