Malicious PDF — malware analysis report

Static analysis result for SHA-256 749b4fb35686d813…

MALICIOUS

PDF

66.4 KB Created: 2020-12-04 13:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad82a5509f9858231f7a9f594bc87e8e SHA-1: de8038b3ccce0004dd8d9c7a4d79a0cad2211d19 SHA-256: 749b4fb35686d8134b1caaf4e2c5e7bfd452c2761e41ba2bf93c83702cce9404
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The presence of a URL with a 'beauty plus camera cracked apk' UTM term suggests a lure for potentially unwanted software or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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.
  • 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/aws?utm_term=beauty+plus+camera+cracked+apk
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/5102503.pdf
    • https://xexezakofiwojuv.weebly.com/uploads/1/3/4/3/134372147/loligegowu.pdf
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/0399b66e92f7.pdf
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f8c4c6ea22c8.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/736024.pdf
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/6d06b1f3abcf.pdf
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/05c7359.pdf
    • https://nunezujotegu.weebly.com/uploads/1/3/4/3/134312528/8118414.pdf
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/badeniwetu.pdf
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f8ac78e191a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc009dd8787e87989674e7e/t/5fc33bb27acac6192a294bbc/1606630323513/portland_oregon_map.pdf
    • https://static1.squarespace.com/static/5fc3624192c50b1a1e875bab/t/5fc6a4953485235c86b142c9/1606853782097/falawelasujele.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8be.bin
cf859afb4199c4b3e04757dcc580760e0cc37ab730af98c0c168ee972137b1d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BE 5436 bytes
font_01_sfnt_off0000db2b.bin
3c29cb6d4f89d68ff2a014424671d9092cea28f0e068c57cd76cbf76009b75fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 10052 bytes

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