Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6261e633e85bf2…

MALICIOUS

PDF

72.8 KB Created: 2021-01-15 04:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e13ee0d90c946ac33d0c344a0749cba9 SHA-1: 70cfbf8eb7ab02435d1bc1466823d8a3055ffa11 SHA-256: 3c6261e633e85bf24091b04cfa82437e777edf74dc5c9321a63ec77f5306a465
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, pointing to URLs hosted on domains like 'sqhk.co' and 's123-cdn-static.com'. The presence of embedded URLs and the overall structure strongly suggest a phishing or malicious redirection attempt, likely to distribute further malware or engage in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=face+shape+guide PDF link annotation
    • https://cdn.sqhk.co/lolajelor/Jihjiha/febefekosuwetu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcd38b96a0a0.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/ghFgd3W/top_hits_of_the_70s_rock.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/ghqgdOo/the_trip_to_bountiful_movie_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/ijXHKZT/62246114597.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/bhgNCgg/27341892664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5fa91eb0a5536.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/hhXgiiW/giminudulotodag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471969/normal_5fe5d9ae8b892.pdfIn PDF document text
    • https://site-1168018.mozfiles.com/files/1168018/99304308047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fee0275856da.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/1815592.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/chehdOo/46292876268.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/iighcG8/coin_dozer_circus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5feb7ce361661.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_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 5160 bytes
SHA-256: 34751d663bd7271c5370c20d12597603dd74c47c6a84f5b2e5e2f19a589fb699
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10864 bytes
SHA-256: 2124a4137c5343beb6a449a916d964b8ca8083c8de40b0ff6dbd93e14bf7cf67

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