Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4cb1e96ee5fdc0…

MALICIOUS

PDF

67.7 KB Created: 2021-02-24 05:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 442374133a43dc6f1cd69ee601876b24 SHA-1: e92774048b068bb3cb72691a8d67bf884bf69fd6 SHA-256: 8c4cb1e96ee5fdc08e386ef549728378d8c0ea260d7681c9f03f116e71a17e69
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'Pioneer avh-x1600dvd software update', aligning with the heuristic findings of a link farm and external URI usage. The primary intent appears to be directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=pioneer+avh-x1600dvd+software+update PDF link annotation
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/fabazirowagibo_roxopamifer_zanerunine_tijezurisujoto.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/hjhighk/t_i_egg_finder_mod_apk.pdfIn PDF document text
    • http://kowesaxulenim.22web.org/bivusivimotolojoburu.pdfIn PDF document text
    • http://huseyincanx.com/metabolism_diet_14_days9bmlm.pdfIn PDF document text
    • https://zejebamusij.weebly.com/uploads/1/3/2/3/132302936/wixoruzijimi.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/Bsggqgg/vemeduxibi.pdfIn PDF document text
    • http://blacktea.space/wumagetof7pdp7.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/gfjhham/iced_matcha_latte_dunkin_caffeine.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/aec957b279.pdfIn PDF document text
    • http://capridigi.com/vetegalmftmh.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/McE0heX/46962849445.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/BzB2Fhb/pupagu.pdfIn PDF document text
    • http://jixuboxa.iblogger.org/47641700704.pdfIn PDF document text
    • https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/9662986.pdfIn PDF document text
    • https://revabusabozuvum.weebly.com/uploads/1/3/5/3/135398016/liwifokiropibe_lixokixezuf_valevomi.pdfIn PDF document text
    • https://kisinamaku.weebly.com/uploads/1/3/0/8/130814290/kexoj-jipese-zinofufalis-pokisinigiko.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/kobivimelelo/can_you_screen_mirror_on_roku_apple_tv.pdfIn PDF document text
    • http://direpedokelazal.rf.gd/weralarajoditubabesuju.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_off0000c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC956 5700 bytes
SHA-256: 4e2e66ede3921aa356cad32793f5249fefd42168cf8c320b0245122f7ca55387
font_01_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 10940 bytes
SHA-256: 39c56bcb077a3072ec591e761942bfa14cf1f596b340fb8129b98a821369c269

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