Malicious PDF — malware analysis report

Static analysis result for SHA-256 18494861398a62ef…

MALICIOUS

PDF

70.3 KB Created: 2021-02-04 13:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6c43f0932c05a803e2405c4e1e1adfd6 SHA-1: 1ea9401eef8e529a1a29b826004d2e59e24c8650 SHA-256: 18494861398a62ef522bb16d65587afc6edbf555c30b6ff251508146395bfd48
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/123?utm_term=solidworks+sketch+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/jizuxadif/TWeYYgj/kick_the_buddy_2_mod_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/hejcqZS/big_farm_story_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/jhGjchi/41756148408.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/gf6gigi/la_redoute_clothing_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5fcdd48aaf18c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_601281200a797.pdfIn PDF document text
    • http://dudipoviju.22web.org/53898921811.pdfIn PDF document text
    • http://fotogodopuxet.iblogger.org/isaimini_movies_2019_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/siabrhe/zijuxetekizige.pdfIn PDF document text
    • https://cdn.sqhk.co/rujuwawuju/I7B9id7/emoji_pic_wallpaper_cave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_6016723f5f938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://regipikiwubadov.epizy.com/home_door_design_catalog.pdfIn PDF document text
    • http://nopuzowisaw.rf.gd/amarakosha_audio_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/boss_therm_bps242rf_user_manual.pdfIn PDF document text
    • http://vavubal.epizy.com/skyrim_bruma_quest_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/93885768389.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/78953617622.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/asura_s_wrath_for_pc.pdfIn PDF document text
    • http://tiwufuwivuvuf.epizy.com/divaresizozironejelejipos.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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 5500 bytes
SHA-256: 1449b401b558818de07e6ac2ab9957146b4e0c7bd56f638519e3e799e341f220
font_01_sfnt_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 10140 bytes
SHA-256: 465b921961d80e63b309c8b0a7a9c8ef334072242ef6dbd13bd1ff55fa6feed8

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