Malicious PDF — malware analysis report

Static analysis result for SHA-256 2016c7530bab0688…

MALICIOUS

PDF

98.7 KB Created: 2021-02-25 05:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ac32af12d7338c0cb041fb8928086aaf SHA-1: 2f0e6066b02f4c990560beee0fca5f6716c0f8be SHA-256: 2016c7530bab06883c2f2ebec807ed7b9e7ccd1294c17f55fa1fc7a23230e632
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDFs hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as Pdf.Phishing.Trojan, and an ML classifier assigned a high probability of maliciousness. The embedded content appears to be obfuscated or corrupted, preventing a deeper analysis of its specific payload.

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
  • 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://yafferge.ru/wix?keyword=shadowrun+4e+street+magic+pdf In PDF document text
    • https://xefikusog.weebly.com/uploads/1/3/5/3/135390274/8002687.pdfIn PDF document text
    • https://dipediras.weebly.com/uploads/1/3/0/7/130739778/vonumerek-xemivepajota.pdfIn PDF document text
    • https://tadeliganunuzax.weebly.com/uploads/1/3/0/9/130969808/7599732.pdfIn PDF document text
    • https://xiwulugizasu.weebly.com/uploads/1/3/2/7/132741433/muvuvu.pdfIn PDF document text
    • https://zepusarogetiki.weebly.com/uploads/1/3/4/6/134687077/6849697.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/24389777370.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/gepeduj-duxawijaf-vasof.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/jufutifepekidew.pdfIn PDF document text
    • https://topagolidokade.weebly.com/uploads/1/3/4/5/134502990/bcfa5923ca263.pdfIn PDF document text
    • http://zipekapivan.22web.org/dakulovazosuluj.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/puvilalema.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/snapper_riding_mower_clutch_cable_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://manosotidokef.myartsonline.com/nipejumowiduzajizusadugiz.pdfIn PDF document text
    • http://poravilotizeve.epizy.com/make_excel_spreadsheet_not_read_only.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/bohr_and_lewis_dot_diagrams_worksheet_answers.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_off00014588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14588 5820 bytes
SHA-256: 17f9273178878c58156b8210ff1c7f0912ed1c75b76b198ad98ad8fd50379e3f
font_01_sfnt_off00015951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15951 10696 bytes
SHA-256: d3312fd306a982e38ecd4c556e5e249413f09c0d17103f031035191431053d69

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