Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4a046a51f86309…

MALICIOUS

PDF

97.5 KB Created: 2021-03-19 05:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 688323d1a4c84a4f8f7d3f3900956aa1 SHA-1: e53b481dc2f6815b4f64b367678b579e99edee8d SHA-256: 6a4a046a51f8630900921ebe9f655eb4792ea5c153d853833d75d04125a1f293
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to lure users to potentially harmful content or exploit vulnerabilities through linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://zajinet.ru/wix?keyword=gotranscript+answers+july+30+2020
    • http://lobulezinovux.medianewsonline.com/puwokijox.pdf
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/dccfb72e6.pdf
    • https://koditagonuxu.weebly.com/uploads/1/3/5/3/135339835/5562149.pdf
    • http://fijazubelanulek.mywebcommunity.org/80884247456.pdf
    • http://belldiscount.ru/how_to_divide_fractions_on_a_ti_30x_iis_calculatorzt4mh.pdf
    • https://cdn.sqhk.co/joremeve/bX5sZY8/golden_wedding_cake_decorating_supplies.pdf
    • http://renosivegegev.iblogger.org/apply_for_british_naturalisation_form.pdf
    • https://kekoluborefox.weebly.com/uploads/1/3/5/3/135327445/aaf3ca07661.pdf
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/mufeb_bivid_bewimojotev_nifepesolixuge.pdf
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/4c64b4009.pdf
    • https://takojetomegupaj.weebly.com/uploads/1/3/1/3/131382497/6028106.pdf
    • https://tetegewa.weebly.com/uploads/1/3/4/7/134761184/nizumemukag.pdf
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/ede3fa35f577.pdf
    • http://koprovk.xyz/gemuzadatozosewijektzf4.pdf
    • https://piwebodowumogoj.weebly.com/uploads/1/3/4/8/134857209/5005806.pdf
    • https://cdn.sqhk.co/zijigemeworu/phiohdK/pasib.pdf
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/3745600.pdf
    • http://vikorurapufor.iblogger.org/slick_rick_songs_free.pdf
    • https://cdn.sqhk.co/juzivadareka/eclgjhb/gekufoparumisuxivaf.pdf
    • http://mirror-x.org/xadesocg0ee.pdf
    • http://siloxolilalapas.22web.org/kenmore_elite_dryer_lint_filter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xuxerutiwuv.onlinewebshop.net/juwoxama.pdf
    • http://sofibimibojas.myartsonline.com/rabebuvirigi.pdf
    • http://kipejefanowisu.atwebpages.com/sample_instructions_for_a_test.pdf
    • http://xatabiraluxuded.rf.gd/lasalesa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001260d.bin
11a9828056646320e39174d0e5e4fe60b02b6200956b087c007f2421ba3a5c84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 5668 bytes
font_01_sfnt_off00013987.bin
cd821b08f601de6d6345cde605acffc0290fe503675bf16180ae104de3d757cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13987 11940 bytes
font_02_sfnt_off0001626a.bin
ea15d0511b9fea00ef419c4f81794cf2253decd86e3ce1eb1520446ad8de3d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1626A 16220 bytes

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