Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f21bbc45c159ef4…

MALICIOUS

PDF

80.6 KB Created: 2021-04-01 06:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ece5193972878bc3bcde6ff154707993 SHA-1: d92aa077bd34ec7bf9aa0bfe5d1103cf4a08adc4 SHA-256: 0f21bbc45c159ef48608108140579d0490fe65d1ed9ae293a8d00351313678a9
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 0.9990

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://midufefew.ru/strik?utm_term=how+to+use+canon+as+webcam+for+zoom PDF link annotation
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/wogina.pdfIn PDF document text
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/2e71a2478e639.pdfIn PDF document text
    • https://zirefugat.weebly.com/uploads/1/3/0/7/130740019/getukuboxoxexoboge.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/465654.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/1069238.pdfIn PDF document text
    • https://bexopugizabon.weebly.com/uploads/1/3/4/0/134042324/0f584e31.pdfIn PDF document text
    • https://sufunisukexe.weebly.com/uploads/1/3/1/3/131381546/3d6c0f4bc1f.pdfIn PDF document text
    • https://fuxuvaxekanu.weebly.com/uploads/1/3/4/6/134648937/9966915.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/jodomowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_cd256c72ee854519b79b75ccc33b1617.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0834c845-e2dc-40e6-8bdf-7ca9946b927b/6106866768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d0bbed-4f72-422f-9291-230db0bda4e0/99854870121.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_b74c5b5d778a4ae681654c1f2310cf8a.pdf?index=trueIn PDF document text
    • http://namajoveteri.epizy.com/1762186466.pdfIn PDF document text
    • http://paravewufazik.epizy.com/vuxoso.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_e7b7f3ebb7084d7c8fede423a9bf9719.pdf?index=trueIn PDF document text
    • http://kupavojos.epizy.com/76929771451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a343cad-3636-4f9a-ad92-e960ca72cff8/dmlt_microbiology_notes_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/medicare_levy_exemption_application_form.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_dcca0a08e5974714b0259293c53a7a44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef174ff-a8c9-4012-93d7-221bb0349aef/soxopegaxidipojotaleraf.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/66807289647.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/cpm_algebra_2_answers_chapter_5.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_33a07f62553349b4b32a9d1f491ba78f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9561c1-72e1-4913-b992-e1678ddf9ac1/52206512152.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 5072 bytes
SHA-256: 42886a338b440cce9783b0dd4bed5eb9999cdc0150f999bce7a391e44b24f546
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10956 bytes
SHA-256: 9e0f71812209b8f6d64845371524954dd8c6ee8aab7e7ed5f094b3228067ccee
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176