Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c3193dbb780f98…

MALICIOUS

PDF

75.2 KB Created: 2020-11-19 10:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 085b7ca3b4c89e7ad9884d798f186caf SHA-1: 1e5961af32fa2dd36b56c91898c6960782001a68 SHA-256: f3c3193dbb780f98bfde8dd58f3ce09f9cd68a3462d35b9ed2e45381a9e178c6
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary heuristic firings indicate that this PDF is designed as a link farm, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

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://traffmen.ru/123?utm_term=maji+de+watashi+ni+koishinasai+routes In PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/funamobuliwewobel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_5f9a841758c09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_5fa8f28931b0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f8ac10ddcbfb.pdfIn PDF document text
    • https://zunovuxosuseso.weebly.com/uploads/1/3/4/4/134497136/50fc27459753.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/2148425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f88cc8f96bcd.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/7933545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_5f9979bd51510.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/752c0c86b9576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12b831b-a33c-40ec-9a48-8f76a404dca1/xagop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f4eba6-f04a-4041-b3ea-3ec38376ab75/woxawuv.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/cancionero_de_rock_para_guitarra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f4e1a9-56e8-4efd-8812-98a5aa83022c/rasisov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/049aad27-873d-47df-9ce9-a6ffbddde2d5/wutukebumogazudiginomod.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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 3988 bytes
SHA-256: 1577f40a0a1265e4be5b2f08f321838f6d75eaf4754e39e0c1e4c38c3262fd96
font_01_sfnt_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 5120 bytes
SHA-256: 2981b54fe6ec5658494245bf0668e893c1db235cc484e08135789496389281f5
font_02_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 10468 bytes
SHA-256: 800946d6e0452a075172566392c3287fefaa8a0baa049961fe0335c1ebced054

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