Malicious PDF — malware analysis report

Static analysis result for SHA-256 1105d3dd7e9ced98…

MALICIOUS

PDF

74.8 KB Created: 2021-01-29 07:16:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f7f7cfb306e6a9def373042e8e206661 SHA-1: d2765768c4ce6fa8b4ec87c190d05496e42e5590 SHA-256: 1105d3dd7e9ced98b4834f12fd323f4a3e3eb363d4b275fba62f8ac3e94a7939
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains junk data, suggesting it is not intended for human consumption but rather to host links.

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://crophysi.ru/aws?utm_term=the+celestine+prophecy+an+adventure+pdf In PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/2099473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5fd6f33d5909a.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/Tjehhhe/knights_templar_symbols_and_their_meanings.pdfIn PDF document text
    • http://lnstagram-office.com/darkest_dungeon_pitch_black_dungeon_guideqvb6e.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/Micjcng/12033517430.pdfIn PDF document text
    • https://wesamirovajep.weebly.com/uploads/1/3/5/3/135383051/2212940.pdfIn PDF document text
    • https://cdn.sqhk.co/retepisej/jjgsiiK/ahl_teams_2021.pdfIn PDF document text
    • http://wowitaly.pro/juwibiuenim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470830/normal_6007e182255b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414498/normal_60003e8ca8ddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_5fdbff5f3070d.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/gedivumefidos-kizaxavukululan-gafixokinaxit.pdfIn PDF document text
    • https://cdn.sqhk.co/poluxofad/ejiPijX/stickman_shadow_warriors_dragon_fight_legend_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489848/normal_5ff3e27d3b5e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_600a4dec87685.pdfIn PDF document text
    • https://cdn.sqhk.co/binuwaxe/sZ2YgcJ/13495091703.pdfIn PDF document text
    • https://cdn.sqhk.co/sexubozadifa/hjidUjg/97629346560.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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 5352 bytes
SHA-256: c058fbde414dae297ef1f9bc66293000ba76c83efa6cc82196e0fa8cb9016a66
font_01_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 10988 bytes
SHA-256: 2e3889416cb39274f9cdf2c907c5f9352c7dab774cc6a9ef1601229997decb61

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