Malicious PDF — malware analysis report

Static analysis result for SHA-256 da71bc372ec70dd2…

MALICIOUS

PDF

86.3 KB Created: 2021-04-09 06:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 806caec19dcca69322617547d27990a2 SHA-1: 78339a660364e02fc127eb5a633e832a88da4fa0 SHA-256: da71bc372ec70dd21a9978d176a17fd35a027bd74c6f804b8ac3387d38a09b89
244 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, and contains a significant number of embedded URLs. One URL points to known malicious redirector infrastructure, while others form a link farm on disposable hosting. The document's content appears to be a lure, possibly for phishing or to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=tres+metros+sobre+el+cielo+serie+actores In PDF document text
    • https://static.s123-cdn-static.com/uploads/4367937/normal_5ffa2c7041df6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_605571cd3d578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419192/normal_5ff562537bd8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453102/normal_60053416f22dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367941/normal_5fffc8526ed40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_600f91b9728bb.pdfIn PDF document text
    • http://poboxabirukus.iblogger.org/mofine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_1120117995f44d8ea0a2d7749d1f91e3.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_f3f03836d6594cbfb74c0c63a3141218.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_53a5b31c2f85409a9d8c4a05f05f0a5c.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_0e496d5187114e03abe7bfc6609cb9c5.pdf?index=trueIn PDF document text
    • http://xetumerim.rf.gd/kauwa_biryani_picture.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_e67f1c34b1d346968046887b59b0c76c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3afaf30-7bea-4053-8c7c-9a090b89b48a/the_hound_of_the_baskervilles_1983_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c02f05-e94e-4862-9a5f-cc51e3532399/what_does_the_battery_light_mean_on_a_toyota.pdfIn PDF document text
    • http://zufagubiles.epizy.com/21915066502.pdfIn PDF document text
    • http://tabijuxez.rf.gd/behala_college_merit_list_2020.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_48abf0e9479e4c45a2542fc4061e07dd.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_2fe4bd1048904f4ea9f9637749a77277.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_92961941b18d4e95bf79c3f01dae77ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab89e44a-0a2e-4590-99d9-d1d97b7e4c97/gexoreravibumunotuzazevi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001239e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1239E 22260 bytes
SHA-256: c582a125664218f374690722443d18e7f587b0c0fcc766af6613916435c6494b
font_00_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 5032 bytes
SHA-256: 9ebac68c38217c17567a7f16934c347ca83ecd1091db314d81ef26524850b986
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 11616 bytes
SHA-256: df4d2fb97d63875fde1221b8ef4f0099b070caeef63effbdc53d68d521a70deb