Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2b484af24b1d38…

MALICIOUS

PDF

73.8 KB Created: 2021-02-20 14:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d3ebe222331b216127484a76251e86a7 SHA-1: 28a8a611902ad471b3772eb8d76dd9762d81e203 SHA-256: 5c2b484af24b1d382bd5870d9096bc7c275491090948f1dd601171fc210566e2
254 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical ClamAV detection for Pdf.Phishing.Trojan. The embedded URLs, such as https://crophysi.ru/strik?utm_term=nordictrack+pro+plus+skier+ski+machine, point to known malicious redirectors. The document body, though heavily obfuscated, contains text related to a 'Nordictrack pro plus skier ski machine', likely used as a lure.

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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=nordictrack+pro+plus+skier+ski+machine In PDF document text
    • https://cdn.sqhk.co/ruvonusebex/h1Rhggh/18135734082.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/ijvkR6L/kaiser_permanente_jobs_maryland.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/Lgiih2k/recarga_unefon_20_pesos.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/fe139.pdfIn PDF document text
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/ca09462b460edf.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/NZWFgcq/bexuvujogodagiwudamaxogi.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/giYkigj/hitman_reborn_english_dub.pdfIn PDF document text
    • https://wijirejilape.weebly.com/uploads/1/3/2/8/132816202/mibakozifujeko_penunironutali.pdfIn PDF document text
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/togudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nosepevozux/grocery_list_categories_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/58201156844.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/ndlea_recruitment_form_online.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/aha_2005_cpr_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/25451911001.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/93944486388.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/58901804412.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/finding_halves_and_quarters_of_amounts_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/social_media_marketing_benefits_for_business.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_off0000d60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 5228 bytes
SHA-256: 6642567c524523e5eb68304e4d994cd88469e5744c69381c492e0463b527ebe5
font_01_sfnt_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 10672 bytes
SHA-256: 2ea842b81109ce6f86a34026f0f9750aa913b5ff3e1d6d6c4fc42e580ed62291
font_02_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c