Malicious PDF — malware analysis report

Static analysis result for SHA-256 19303a46e017b470…

MALICIOUS

PDF

67.8 KB Created: 2021-01-25 05:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6fa46a5f4072d083fabf43dc8ce97799 SHA-1: 9a010c7e8fc7e3cc88b7b49fc442f80d656c9241 SHA-256: 19303a46e017b47004bbe0690f45f1f2c07883e8fc77dbc0b488883759bb881b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary goal appears to be directing users to external sites through a link farm.

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://yafferge.ru/123?utm_term=best+buy+minnetonka+store In PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/nabob.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/jji5yib/18222577469.pdfIn PDF document text
    • http://tujozavido.66ghz.com/sat_dec_2016_answer_key.pdfIn PDF document text
    • http://dagomakiluje.iblogger.org/87332282474.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/gdBQ9ji/lirisuvomikaxajirijevumid.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/paturazoken_giloxatil_logape.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/33ojjja/sizepugelojukebuwekojuget.pdfIn PDF document text
    • http://ranomurivokav.22web.org/github_branching_guide.pdfIn PDF document text
    • http://dunetetemob.22web.org/rockstar_full_movie_720p_9xmovies.pdfIn PDF document text
    • https://cdn.sqhk.co/sujutowupolu/dqwjbjf/washington_crossing_the_delaware_river_facts.pdfIn PDF document text
    • http://rewuvov.iblogger.org/43885536217.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/gidNi37/minecraft_minigames_plugin_1._14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozotonitiki.epizy.com/51111581716.pdfIn PDF document text
    • http://josetevuj.epizy.com/mufisarexagexelelobup.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 5152 bytes
SHA-256: 0ad3f23f53a7336646d48f933bc85fa5a37641d6b9fb7caba456eebf025b2689
font_01_sfnt_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 10800 bytes
SHA-256: b2e506677c02e96075dececacbf8766c78e639f7ac7b94700f579860c5610b15

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