Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3f5769f41aaeef…

MALICIOUS

PDF

71.7 KB Created: 2021-02-26 13:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 82669c2daff20fb01e343ab27c0cb064 SHA-1: 107f70d6d646305e3cb8de28aae701da3e0a0c35 SHA-256: 3c3f5769f41aaeefde7e57b6dc7ca16bb92c9f260717417daef4e4ee96315af9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as Pdf.Phishing.Trojan. The embedded links likely serve to redirect users to phishing sites or to download further malicious payloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=when+to+use+commas+in+a+series+of+adjectives PDF link annotation
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/jisatakulof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_600b55b69fd6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453100/normal_5ffea782e1e9c.pdfIn PDF document text
    • https://raxefikijizusiz.weebly.com/uploads/1/3/4/8/134881470/tofojo.pdfIn PDF document text
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/pobuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/hchhblh/amazon_gold_chain_earrings.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/kefizoluv_vezozegiredapo_nulufabiji_valosotodagepov.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/341787.pdfIn PDF document text
    • https://tumunuwixa.weebly.com/uploads/1/3/1/3/131384432/7d7524d06f.pdfIn PDF document text
    • https://dogenirifalalu.weebly.com/uploads/1/3/0/7/130775866/707402.pdfIn PDF document text
    • http://rulazix.iblogger.org/xujatumeleg.pdfIn PDF document text
    • https://vuvitolivudiru.weebly.com/uploads/1/3/2/7/132712253/xatufumadam-bufowudawidabo.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/cicEiiP/gexovufazoxejisipinuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_60343994a6a69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remavuj/93480953645.pdfIn PDF document text
    • http://likijanima.epizy.com/dujanoxajarukazebiro.pdfIn PDF document text
    • http://gulavofi.epizy.com/bluetooth_usb_dongle_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/49962203289.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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 5380 bytes
SHA-256: 5549582e40d2d8da3eca4bd34e4800855228d0f6fe19ed1fb0d2a26585efc588
font_01_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 10800 bytes
SHA-256: 31702e77b1aa36d58e22ac58fcf112460a40782328be71bad1b2b3db14c30ee6

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