Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadd7c64fa1b91ba…

MALICIOUS

PDF

122.5 KB Created: 2021-05-30 04:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 48d56c97e74eaed1f9da0bb88423e479 SHA-1: 29121897f6f8347682f632110604cc3c36f7cd30 SHA-256: eadd7c64fa1b91ba8bba8343fa7f353774595fc852c3b242ab68799f6a25b0a8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the document's structure point towards an attempt to disguise malicious redirects as search results for free PDF books.

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://seumenha.ru/strik?utm_term=recetas+el+poder+del+metabolismo+frank+su%25C3%25A1rez+pdf+gratis PDF link annotation
    • https://gexokatex.weebly.com/uploads/1/3/5/9/135960098/4d062f3bcca6.pdfIn PDF document text
    • https://ripafikumitepi.weebly.com/uploads/1/3/4/6/134622323/9766377.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5fca708a5aea6.pdfIn PDF document text
    • https://bigeriburaline.weebly.com/uploads/1/3/4/3/134334921/2601658.pdfIn PDF document text
    • https://fokepepepaxa.weebly.com/uploads/1/3/1/4/131483327/6431a139.pdfIn PDF document text
    • https://mefovisesivem.weebly.com/uploads/1/3/4/5/134525463/6903831.pdfIn PDF document text
    • https://fuloronarenor.weebly.com/uploads/1/3/4/8/134880411/e7fd9c2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423155/normal_5fe29a94a8df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_60157f8e93328.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/jixokedixanop-pupedezorifer-muzemomasax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481515/normal_5ffce5f621bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_6022f58b92f81.pdfIn PDF document text
    • https://lijoliwaxodoxi.weebly.com/uploads/1/3/1/3/131398144/desulonebut-xusenakuvune.pdfIn PDF document text
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/907fb42bfd3a1.pdfIn PDF document text
    • https://nefalitarula.weebly.com/uploads/1/3/4/3/134308949/bb66b7c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_60291abf42e73.pdfIn PDF document text
    • https://warenumew.weebly.com/uploads/1/3/4/8/134871813/1953001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_603cf14bb9440.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://uploads.strikinglycdn.com/files/6bf3ad54-fb89-47eb-922e-ca1cb2111fb3/how_to_remove_a_drain_plug_from_a_badger_garbage_disposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7cf2319-cb6f-411e-b22d-13fa24ff0d42/74646538253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6660544-974f-4010-b454-f276e50c81e6/zifopodezuzosoril.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_off00018b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B02 5852 bytes
SHA-256: 11fb43317d40a6d3e841d05a0a2666c70dc024cfb47e460e634e6ba387faa8c5
font_01_sfnt_off00019e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E47 14560 bytes
SHA-256: ce50c36bb2285d62a2eaf2bb7e5f80cf69d57486a6b1f8e6258e338c6f9f9e49
font_02_sfnt_off0001cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB46 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333