Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d220728ba40178…

MALICIOUS

PDF

81.4 KB Created: 2021-03-11 17:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b21e7741638dc436363d56087426f458 SHA-1: 500933ce82ba029d00d614195d8996f651ad7d10 SHA-256: a6d220728ba40178790b69bac23abaebfade6554b46c769714a23a2cd81bb711
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and contains external URIs. The document body, though heavily obfuscated, suggests a lure related to 'natural antibiotics PDF'. The presence of numerous URLs, many hosted on disposable domains, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=libro+antibioticos+naturales+pdf PDF link annotation
    • http://bazis-rostov.com/70944894577gi73r.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/34296302374.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/coleman_presidential_electric_furnace_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/hizeheN/46589071385.pdfIn PDF document text
    • http://kersita.space/67652546955s0j0.pdfIn PDF document text
    • http://tublitalia.space/12789696780soe70.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/53898172451.pdfIn PDF document text
    • http://moxipafuxoxo.mygamesonline.org/bharathiyar_padalgal_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/cijzuhg/cubes_math_strategy_free_printable.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/60027954333.pdfIn PDF document text
    • https://cdn.sqhk.co/wawabosamugo/jcQjhjf/jerixekafupadowalananogi.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/how_to_hand_score_the_basc-2.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/ndgiuhd/64156348589.pdfIn PDF document text
    • http://beremoter.online/84639516441i2697.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitines.myartsonline.com/bodmas_questions_for_class_7.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/31847262009.pdfIn PDF document text
    • http://jifobobaganut.epizy.com/gekerigatiluj.pdfIn PDF document text
    • http://vamavaremimot.atwebpages.com/plan_de_negocio_para_abrir_una_cafeteria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf578c1-e7b2-4208-bf89-fdd3b0eb03b3/1582970657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d37a87-473c-412d-a3b9-3841803d5752/survival_movies_netflix_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba21b7e9-2929-434c-8581-70c15aad805b/kuwaxezupasepiridepefoka.pdfIn PDF document text
    • http://xotopunutogor.rf.gd/wamulolipuzuzanediweki.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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 5228 bytes
SHA-256: 9b528609f902e9960e04db0d9d1928504a2be11140cf684b1311e8679c58d1bc
font_01_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 11312 bytes
SHA-256: 988c5aceacf71acf5e8620201f07a912de47fdabde4f2d8f24824f3e18a98b2c

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