Malicious PDF — malware analysis report

Static analysis result for SHA-256 160021c9059576d2…

MALICIOUS

PDF

77.9 KB Created: 2021-03-23 08:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 68a2c5c9602edbf438035e067018d4b8 SHA-1: ba02c27f590855db5564cb368b00730ab40fc57f SHA-256: 160021c9059576d28b584f92dc2e1998889905932e08876e84886fe2b86c74b4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=wpnfire+cheat+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385417/normal_604e673752496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_604f1f6426316.pdfIn PDF document text
    • https://vulefinan.weebly.com/uploads/1/3/2/6/132695887/pevubaxabi_bonosigul_negidaninebej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_602568fc92bab.pdfIn PDF document text
    • https://soxigirotum.weebly.com/uploads/1/3/0/9/130969819/74a24dc4662253.pdfIn PDF document text
    • https://kiwaposuxixu.weebly.com/uploads/1/3/5/3/135329520/7d11f5e.pdfIn PDF document text
    • https://kijujula.weebly.com/uploads/1/3/4/7/134756294/8998191.pdfIn PDF document text
    • https://jibojirugaj.weebly.com/uploads/1/3/4/8/134846900/f0e9203.pdfIn PDF document text
    • https://tidijesugeji.weebly.com/uploads/1/3/4/7/134764535/5270865.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5ffd88e7667dd.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/diduso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://risuveliki.rf.gd/alpha_beta_pruning_example.pdfIn PDF document text
    • http://fixomixipewuwa.rf.gd/letakuzuxonotuku.pdfIn PDF document text
    • http://zafurug.epizy.com/60825481164.pdfIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_b4281999e2504c79a72c259329cfabc6.pdf?index=trueIn PDF document text
    • http://jepevam.rf.gd/how_do_you_reset_a_bosch_silence_plus_44_dba.pdfIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_4871d4c7d4ea4dadb3a805bdac67f1e9.pdf?index=trueIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_de82d1e970c846e2a13c76860daee0b9.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_aec84bc2c8a1404cbafc5c274e0fe662.pdf?index=trueIn PDF document text
    • http://gegagino.epizy.com/sheet_metal_accessories_near_me.pdfIn PDF document text
    • http://kelopejawutan.rf.gd/76340694875.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_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5224 bytes
SHA-256: 6134536df11f48bc2c08f0a7be02410707b378afaa89d76ddd6c55fa3cc9134a
font_01_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 10924 bytes
SHA-256: 6fd85a213b9deb0de6e77d10e02b1dd585790984105f0f44566dc05ed2376fbf