Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d3d906980e74bf…

MALICIOUS

PDF

81.5 KB Created: 2021-05-10 21:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 35056c4f2b4fe50a71f2eccc6a930287 SHA-1: 3f0459f8df5ed47f94072f3f287c8bc00174ebfd SHA-256: a7d3d906980e74bf4b62df0d206d0f97e812d20863a2fb4485ce00752422a369
226 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The document body's content, referencing a printer password, is likely a pretext to encourage users to click on these links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ponafet.ru/strik?utm_term=how+to+find+the+password+for+hp+deskjet+2600 PDF link annotation
    • https://jodalutuz.weebly.com/uploads/1/3/4/4/134444421/cccb23ce08.pdfIn PDF document text
    • https://gawujura.weebly.com/uploads/1/3/5/3/135325150/9227903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_6045fbb5c86f6.pdfIn PDF document text
    • https://dazifeduko.weebly.com/uploads/1/3/1/3/131380279/8370990.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/ggPAja9/fox_sport_rayados_vs_liverpool_en_vivo.pdfIn PDF document text
    • https://rovinimowi.weebly.com/uploads/1/3/4/6/134682499/nupasop.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/eM2q7MH/hmrc_self_employed_grant_august.pdfIn PDF document text
    • https://cdn.sqhk.co/vapitinab/S0jfIhe/92396379073.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/5377fe9.pdfIn PDF document text
    • https://cdn.sqhk.co/kutisetu/hfqhaoc/lofirotod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5ff4667560162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_603c6c754986c.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/e0279794-120b-47eb-bcf2-c9d074605022/nijireto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c9ef3d-3709-416b-84cf-8231e39c1d9f/timex_indiglo_alarm_watch_instructions.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_b617444d8cdc4e26b62c608d259a9058.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_68de51f1e34b49c2b7536f5f2b77b077.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b79e05-79f3-49fa-9b4a-e6088ccdfffe/8621006251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d0164a-dc6a-499f-9bd1-74d4a63ff3d2/tidunelemad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601889c5-1aaa-42ed-bbd5-27766f3720ca/organizational_culture_meaning_and_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf80c05-769e-42d8-9cee-3f2b43e39237/doderupugom.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_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 5504 bytes
SHA-256: cf97afb489d755bc9342d815a0048eedfea7144813113aae5814b7b0dfd723b4
font_01_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 10772 bytes
SHA-256: 09c25b418c808ee5d36f5ba66e0809762230f02038a17e0f0dbed190b17d783b
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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