Malicious PDF — malware analysis report

Static analysis result for SHA-256 5422af9416f48527…

MALICIOUS

PDF

67.0 KB Created: 2020-12-13 15:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5043fa8fe0b999418dc8f155e5388571 SHA-1: e5b9e506eece4b20060c8befeed7af07dd050259 SHA-256: 5422af9416f4852706aabc939e7db02ef21f66fb5b75f2b762c968d6a0876b15
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many hosted on disposable domains like weebly.com, indicating a likely attempt to redirect users to phishing or malware distribution sites. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=aqua+dash+jansport+backpack PDF link annotation
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/0cbd4c5e54a4e.pdfIn PDF document text
    • https://sepubipig.weebly.com/uploads/1/3/4/4/134445985/vonup.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vudodapazepipux_kijemomebegax_velagokotukif.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/purabitaka.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/nagesulu.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/rosavumojese.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/besafefaf/minecraft_1._14_free_pc_cracked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32554bf6-47fc-475a-89dd-352793d3802c/28423901001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406ee2f2-664e-4172-bbbf-3abb42370df6/34998285106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492f1e2a-0df7-42b8-885a-3baddfe726d3/i_know_whom_i_have_believed_scripture.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/lab_attendant_answer_key_2018_evening_shift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b433704-1307-42be-9ea0-2855488bb95c/words_that_start_with_tum.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/absurd_synonym_formal.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f73d1c8c741314321d77/t/5fc223fd5147b148047b5c3a/1606558717839/att_router_5268ac_port_forwarding.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67B 5524 bytes
SHA-256: 761c8ebb94e63816bb98949f2ed953ce15570ed15f0b549a202a00f07c945067
font_01_sfnt_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 10768 bytes
SHA-256: ff76ca340b7fd1e3a21bc2ed28a4b26922a1b90af6bde8250a3feab21f1acc18

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