Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a8caff8dd30606…

MALICIOUS

PDF

76.8 KB Created: 2020-11-20 22:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4155e6727b425679d6fcabe399e4d344 SHA-1: 950e1d49480e942f750bc196c145456449089838 SHA-256: 85a8caff8dd30606a0d76409544dd425501e05cababea2e674d4c109a4f80446
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly and S3 domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=kcl+relative+melting+point PDF link annotation
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/vikanofugabapixivuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5f92f671dad8a.pdfIn PDF document text
    • https://nebomigefut.weebly.com/uploads/1/3/4/3/134359696/wosawapipopu.pdfIn PDF document text
    • https://gupugeja.weebly.com/uploads/1/3/4/2/134235999/7603994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f89c818cc26b.pdfIn PDF document text
    • https://rumeravovavupol.weebly.com/uploads/1/3/4/6/134619367/966b7137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_5fa6a29c3502f.pdfIn PDF document text
    • https://donibirumot.weebly.com/uploads/1/3/4/4/134463545/xopojadito.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/wixamupelinere/somers_high_school_famous_alumni.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/77558121181.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/fakupelobiza.pdfIn PDF document text
    • https://s3.amazonaws.com/dirijazi/lacrosse_test_and_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/18597379385.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/functionalism_meaning_malinowski.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 6492 bytes
SHA-256: e372b72275a5be51254aef29237819e264f8666627f7fcebc053501b44a96939
font_01_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 5104 bytes
SHA-256: 7bfb53cfa0a76c53a8371ce352ba25ea1086f4d3f9775e05e567ec6b2dd1fe40
font_02_sfnt_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 11160 bytes
SHA-256: 77d8506d07b05c2f4c07d068a550b8061635598abe66a1262e2e0f2fecdc860d

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