Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd08e2be48c5986…

MALICIOUS

PDF

70.7 KB Created: 2021-01-20 11:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ac264f339124645f114786502cc4e32b SHA-1: 3e5d8fe524d59558d09dda085bf6734d9122d2ba SHA-256: 2bd08e2be48c59866c8ed8269cb4361fa72475b8b6805927427e146907b8c0cf
244 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of a link to a known malicious redirector infrastructure further supports this assessment.

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.
  • 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.
  • 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://cctraff.ru/123?utm_term=forecasting+weather+map+worksheet+%25231+answer+key+pdf In PDF document text
    • https://cdn.sqhk.co/bimafaboxugu/6heghxW/zizadeduwu.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/zemiraleb.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/9Nij5Xy/carnival_clown_toss_game.pdfIn PDF document text
    • https://site-1174534.mozfiles.com/files/1174534/infective_endocarditis_icd_10_data.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/QEidjgA/puppy_wallpaper_hd_iphone_xr.pdfIn PDF document text
    • https://site-1173730.mozfiles.com/files/1173730/complete_biology_notes_for_ssc_cgl.pdfIn PDF document text
    • https://site-1166675.mozfiles.com/files/1166675/tegra_crafting_and_building_survival_shooter_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/5idkidf/scruff_meaning_in_malayalam.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/9707061.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/rubiwobidawu.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/dovulavavo/59936929020.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/tenegutuwegukukofazepewag.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/12435239854.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/purebdcraft_1._13._2.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_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 5428 bytes
SHA-256: 01f52a2a65688533fbaeb6a364c9dd3d747880828002a6a7990bc81ee050e39a
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10828 bytes
SHA-256: b8e36943104a6cb86073af610a69a22c690accd03b34e0753a66c120e0a65e2f

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