Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f972494bd70a05…

MALICIOUS

PDF

68.0 KB Created: 2020-12-20 14:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7a01e8a1c68a0ee2870f8b58fde50a0d SHA-1: b28932b0e362996350d530d074573370f147108c SHA-256: 23f972494bd70a05c9f419b53ceedb0e31042b253934820a248140cd62289794
204 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as an SEO link farm and redirector. The document body, though heavily obfuscated, suggests a lure for downloading content. The primary malicious URL, 'https://trafficel.ru/strik?utm_term=the+invisible+man+pdf+in+hindi+free+download', is used in conjunction with a link farm to potentially deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=the+invisible+man+pdf+in+hindi+free+download PDF link annotation
    • https://gokivasinu.weebly.com/uploads/1/3/4/3/134334496/6176570.pdfIn PDF document text
    • https://jamexujibelesuw.weebly.com/uploads/1/3/4/7/134748805/gudigatewabogam.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/8f502cae-8344-45e2-9d4d-816d39710581/kozomovujesabitetib.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/92287783646.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/best_dslr_camera_apps_for_android_2018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd363137a75c289d58a145/t/5fde211e8afbbc2717543fe2/1608392991597/pakugajabakegowovuxazinu.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/xetigenivugomoxojuvolexa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf8d331d0df60ade64d14c/t/5fd1857bd97b572b89d2904f/1607566721636/didi_and_friends_lagu_baru_2020_ambulance.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/vipenetevajadedulopiw.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/28130511875.pdfIn PDF document text
    • https://s3.amazonaws.com/xukidosifixi/mamonupefiruz.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_off0000c12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12C 3016 bytes
SHA-256: 2e5edb16b3213aac72f044458146fa31432b4de2d099e09bd529977e30638444
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 5524 bytes
SHA-256: 21a6710bf9eebdf6acb26c90520ee7d1745dcca96d8d58a5879e1270b28c336b
font_02_sfnt_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 10464 bytes
SHA-256: dd6d681b79a8e3f065b58fda5ca3192e91c50a5495d2a1fc6076588753ab0a89