Malicious PDF — malware analysis report

Static analysis result for SHA-256 681b0a362df29092…

MALICIOUS

PDF

61.1 KB Created: 2020-11-25 08:58:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 57fd10eea4a23db3c0f335693c548bdf SHA-1: 8efb9cd47717fc9ff51c2745396c35802b3004cb SHA-256: 681b0a362df2909260d17ac7f145eb48f8db2a65531fd8d5e0d828b5cbfbb1f4
244 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords like 'Singer knitting machine for sale' which likely serve as a lure. The presence of multiple PDF links and a critical ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://traffine.ru/strik?utm_term=singer+knitting+machine+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_5fba4e6a5c6f1.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/jodizitejup.pdfIn PDF document text
    • https://gepolurur.weebly.com/uploads/1/3/4/6/134610134/aa170bd4488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_5f8e07ae8d28a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5f9cb3a9b1c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f8ed61a57c6e.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/nijulavoniret.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_5f9d4a5a3ff55.pdfIn PDF document text
    • https://pozojemiveze.weebly.com/uploads/1/3/4/6/134690114/wixajonezo.pdfIn PDF document text
    • https://dawofatodir.weebly.com/uploads/1/3/4/7/134756430/986732.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/gupuso/bangla_chaitanya_charitamrita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a0ba6e-edcc-4d07-9982-91bcd9ad4693/pufubovisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7997207-ba72-40ae-8a13-8d7a8ed460d6/18951934096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/860e296e-0e6f-4323-9f3b-c686cda6d267/vinesoludobaxalolukewuwu.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_off0000b48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48B 5464 bytes
SHA-256: 0901f88f06b5a74e36b00e6e1ee57342982a2f570fe7bea911e2537f94213c1a
font_01_sfnt_off0000c6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F9 9572 bytes
SHA-256: 7661be5d461314eb1db65012d7477aabbeff765b7adb9df4faa1dfec75f51162

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