Malicious PDF — malware analysis report

Static analysis result for SHA-256 2978efbfae8e6735…

MALICIOUS

PDF

73.3 KB Created: 2021-06-08 22:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 98d5fdf956b250d4e6253e0232bb287d SHA-1: e40de9109aefe43d2e5571d18824f0f9961bbb3a SHA-256: 2978efbfae8e673518995ce0c01230cc452a8d68db92d9fbfe3f5428af39b527
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains a significant number of external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://garglob.ru/pbw?utm_term=globalization+writing+task+2 PDF link annotation
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/2657751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5fcb7b3e7c45f.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/8670231.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/9f428.pdfIn PDF document text
    • https://lowixuwegula.weebly.com/uploads/1/3/0/7/130775587/44d4b1.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/72d3fbf65797008.pdfIn PDF document text
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/lajuretemekab_kazoweb_fimumikov.pdfIn PDF document text
    • https://zawevujavesid.weebly.com/uploads/1/3/2/8/132814930/6148435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_6044cc3d8b166.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/neninadafekut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_600f7de99144c.pdfIn PDF document text
    • https://zobujonewuw.weebly.com/uploads/1/3/5/3/135389851/vosefafidarimexe.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/begobofabisox_vewepij_zilixuzetosor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_603a4a4653e82.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/bunanu-luwidobiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_60602fcbb25d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a8c275-5a14-41c8-af7d-c2676bc7103d/dijovofifabidef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10a6c12-088c-4753-b128-0465982d81c4/29364160410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ddf474f-7bfe-4a95-849e-28c938164f3e/how_do_you_calculate_reading_fluency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173a086f-98d8-456e-9284-e7275585738d/69698209885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37249b0b-7642-4e55-89a6-df7acef1f643/the_forever_war_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e349b0-792d-49bf-ae39-87ffa03c39f7/what_is_high_concept_science_fiction.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_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 5364 bytes
SHA-256: 38ce0dab2e7546c0e2080d172140ef0a207fbccc181eb1757ed76d6415d1ee33
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 10808 bytes
SHA-256: d78fba31e9598ddc07bdc6ce7e87e974b77530879ef2bfb177332d4974967db4