Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ac1c22a37513d2…

MALICIOUS

PDF

76.0 KB Created: 2021-05-31 08:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a8a32f0b51d43d78877b28cdb83c068c SHA-1: 198b0f2c5851d7a415b0eff49f47f7b0b813cdad SHA-256: c7ac1c22a37513d2df6a64610b5bc19de309894e9c7323765586f477b34af769
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm for distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm point towards an attempt to trick users into downloading cracked software or other potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/123?utm_term=able2extract+professional+7+full+crack PDF link annotation
    • https://sowuritujozefa.weebly.com/uploads/1/3/4/6/134621612/8544397.pdfIn PDF document text
    • https://pisesiwez.weebly.com/uploads/1/3/1/4/131453260/c308e948f4.pdfIn PDF document text
    • https://tujowijide.weebly.com/uploads/1/3/0/9/130969571/9cc97306f4.pdfIn PDF document text
    • https://diwirutug.weebly.com/uploads/1/3/4/3/134387727/kiseparinep.pdfIn PDF document text
    • https://wivevesatowot.weebly.com/uploads/1/3/0/8/130813399/rimusofoni_furogexukeri.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/fafakezutuxo.pdfIn PDF document text
    • https://bidumijedurazi.weebly.com/uploads/1/3/1/4/131437194/vilexokipapoxi.pdfIn PDF document text
    • https://jikevumuvovidu.weebly.com/uploads/1/3/4/3/134324483/951f02c39764473.pdfIn PDF document text
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/ropunetitunave.pdfIn PDF document text
    • https://netevidogewe.weebly.com/uploads/1/3/4/7/134715311/kewus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_60369c1ba26da.pdfIn PDF document text
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/3329703.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/degatokew_xufudusa.pdfIn PDF document text
    • https://direfuxapiw.weebly.com/uploads/1/3/4/3/134371974/cbda7b189894.pdfIn PDF document text
    • https://patodenum.weebly.com/uploads/1/3/4/6/134657208/furis.pdfIn PDF document text
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/bikubapuzofab.pdfIn PDF document text
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/be2859a9dbfc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_601ff2b097c0e.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/a66bb6a0-b334-4493-bc6c-39c0f1542290/what_is_probability_in_statistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d1d3fff-86d8-4360-b168-001aa62d3b0e/wd_my_cloud_ex2_install.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8919cdb-03b9-4f2f-a006-96e683a03fdb/49048570563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52d2241a-1aa5-4c9c-b808-f40c9c971a39/american_pageant_history_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f28a309-5c5f-47a7-9ba1-c0e130607340/totaline_thermostat_manual_p374.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_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 5484 bytes
SHA-256: 930defefc0ed4b22c6b942e1e30f61244514abf68b768aad0f6c8c10f5aa0266
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10868 bytes
SHA-256: 561c8e7ee74e3a4f754bc06d9db02d872319bd95dba57e3bbdc6fe5fe95dc7e9