Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52c8cf5ed63290e…

MALICIOUS

PDF

66.3 KB Created: 2020-11-19 23:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5a6dffe55856b24838514c8db41688ff SHA-1: 7749ff571ccbf1f9d07b47714a747089d52f34eb SHA-256: e52c8cf5ed63290e375c742bb281626cccc1739b6fa21071f96598cc56d837aa
204 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It contains multiple external links, including one that acts as an SEO redirector for a 'free-download phishing' lure, specifically pointing to 'https://trafftec.ru/123?utm_term=vice+city+android+apk+obb'. The document body, though heavily obfuscated, suggests a lure related to game downloads. The presence of numerous external links, including a link farm, indicates an attempt to drive traffic to external sites, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?utm_term=vice+city+android+apk+obb PDF link annotation
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/9657474.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/9608590.pdfIn PDF document text
    • https://fuzuvetidodevik.weebly.com/uploads/1/3/4/6/134637128/9896323.pdfIn PDF document text
    • https://ruwelijowabol.weebly.com/uploads/1/3/4/3/134307429/voxibukefifizur_xafosojiribaje_dejefatuluv_falopoxe.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/pevuwarobuvowa/amazon_black_friday_vizio_60.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/arkansas_affidavit_of_financial_means.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/borderlands_the_pre_sequel_grinder_recipes_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de71b702-9255-4323-9125-cad79729808b/kijeratozusajipes.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/60185703385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76e154a-7cdf-49c1-9885-3df4bd80fbf7/24241334726.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/52989000343.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/parasite_online_free_greek_subs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 5128 bytes
SHA-256: 3e840b469804a5ff4058288aa8b2824b008bf0a75aba98ec22b50021f99a03b1
font_01_sfnt_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 11648 bytes
SHA-256: 43cfcfffe9c93a7d5ccdb0e02a3b02e03f32645a1fd4cedc84e2d5fdc70bd9e1

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