Malicious PDF — malware analysis report

Static analysis result for SHA-256 930749b2d51aac5c…

MALICIOUS

PDF

95.7 KB Created: 2021-04-22 23:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0fa6505d6cad367aa76293da731da357 SHA-1: 1b0307e1e1e64862e98cb2f41bfb5fe44fa06a9a SHA-256: 930749b2d51aac5c154495d606c09feeb499957910a7a9cbf27615d4025bc9cb
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated content and metadata suggesting it was generated by wkhtmltopdf, and the embedded URLs point to disposable hosting and a redirector, indicating a phishing or malware delivery attempt. No scripts were extracted, but the presence of malicious links is sufficient evidence for a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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=sig+p938+9mm+with+laser In PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/1924c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470028/normal_602c0e62e9a3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5ff8490d4db34.pdfIn PDF document text
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/nedamobotiba_fejogajewigepa_zosuwalepifumi.pdfIn PDF document text
    • https://demujerifusa.weebly.com/uploads/1/3/1/4/131437649/witala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_6059ef99aa9f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_600249140d3f2.pdfIn PDF document text
    • https://filokizufotol.weebly.com/uploads/1/3/4/4/134455434/pepunivejexota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_601c614382a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445736/normal_6057acccadacb.pdfIn PDF document text
    • http://kusulapezep.iblogger.org/webokofitotujozurumaj.pdfIn PDF document text
    • http://wotimose.getenjoyment.net/71935908564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_5fd68cfe9e124.pdfIn PDF document text
    • https://maverutorolo.weebly.com/uploads/1/3/5/3/135393183/musopima.pdfIn PDF document text
    • http://dusosax.66ghz.com/3685041572.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://s3.amazonaws.com/tigovatolis/ignou_b._ed_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/40141848197.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/94455532096.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/39655440737.pdfIn PDF document text
    • http://sozejegisiwex.epizy.com/83141423.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_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 5516 bytes
SHA-256: 081b572764a8740144607fdbd7949697d95e0ac054780020674b699ec51321af
font_01_sfnt_off00013a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7A 12004 bytes
SHA-256: b65547ed5a9ec349f1d26238df6b08ea848401cbf5641acd5f4cd8bb822cb8fb
font_02_sfnt_off0001638e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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