Malicious PDF — malware analysis report

Static analysis result for SHA-256 0035f9b8578a7587…

MALICIOUS

PDF

71.6 KB Created: 2021-01-05 05:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 66b782ed955bb9e4475b582d5189b2b5 SHA-1: 6bdb4b1d3eb346b3943a67b185f4c3e33da7f02f SHA-256: 0035f9b8578a7587a2e81445c6e70efddc676f3228f10d069475e09a28957ae6
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms on disposable hosting. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/aws?utm_term=asthma+treatment+guidelines+nhs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_5fb959f352065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fee8936ce14b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418574/normal_5fc4a9f6eafc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482860/normal_5fc89854ede07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_5fb7091dc6933.pdfIn PDF document text
    • https://mokogexikimowo.weebly.com/uploads/1/3/4/3/134321985/wubekik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_5fa56e490b507.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/6795856.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/kijazepoma-fapigodeka.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/jiferopusovodorefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_5fb6dc0e3f3a4.pdfIn PDF document text
    • https://dawozonejuveru.weebly.com/uploads/1/3/4/4/134489779/f5f02499729b.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/f2f2fc48-ec28-462d-a04e-7deb312c87b3/the_body_and_the_reproduction_of_femininity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018843d8-5115-466a-805d-91b5a7ee11e4/26011987858.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/child_labor_images.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_off0000cf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF90 5000 bytes
SHA-256: b2eaab308ea6e2f2980aef854727b51cb54125e11253ad87bcca4deb40632d7d
font_01_sfnt_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 10324 bytes
SHA-256: fc043cc55da0ae935172d350c97341c48f8cc01ab724b498b0fc01a98a9e7917
font_02_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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