Malicious PDF — malware analysis report

Static analysis result for SHA-256 317591dfdf45d6ce…

MALICIOUS

PDF

83.0 KB Created: 2021-02-23 00:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b16f18415715821cdcf6cdce815c13d0 SHA-1: 7abcc4b12ac1d10a17941395f2b6a68b35855070 SHA-256: 317591dfdf45d6cef18b3f5e6ec8171dc84ac34087b93d7ed3967d66ceae7b59
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The heuristic firings and ClamAV detection strongly suggest this PDF is malicious, likely used for phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=bergen+academy+after+hours+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_6021f7961049f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_601286d691a9e.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/heidjha/bunny_run_2.pdfIn PDF document text
    • https://zigakenipipoto.weebly.com/uploads/1/3/4/1/134131781/47f0f9fe3d264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486193/normal_5fcf84d34521d.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/9458885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5fc5cda9d641f.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/ZPhiagi/zadivuzojisagebeto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446377/normal_6008188d72888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_602f99d0ab541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_6014c8c5ba7ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_5fd3b8138fde5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_600694081758c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_600ca5e66cc96.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/dychcic/twitter_careers_new_grad.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/fiabWAO/wix_sign_in_with_apple.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/3968273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fd646b67c4df.pdfIn PDF document text
    • https://bifekanivixu.weebly.com/uploads/1/3/1/4/131408854/6964801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5fdc66b7d1e91.pdfIn PDF document text
    • https://kexanitafax.weebly.com/uploads/1/3/0/8/130813084/dd3175771ecd46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 5828 bytes
SHA-256: cccb165af19c31c5c1e025f4ba0a1adb3451d3abcf68fca8d276458fcef1afc8
font_01_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 10924 bytes
SHA-256: effd507a9befbc0bab7e94f43881bb440d737c52356a035eef8f89a1fecce7eb