Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6e26db49cc958e…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 18:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a6303dfc021b2ee5d6dccf125876dc94 SHA-1: a2e57ec53a8bb74ce1552c317220c1d0e6ec63e7 SHA-256: 1c6e26db49cc958e2d7555a7f053463e8832d366b6cd9ff3a65e4fd31fa76640
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector services, indicating a link farm designed to phish users or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, likely leading to a second-stage exploit or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=fruit+and+vegetable+smoothie+recipes+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_5fea21ffe4feb.pdfIn PDF document text
    • https://pefisidedufe.weebly.com/uploads/1/3/4/9/134902532/7067e.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/riwivosebefikekirago.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/20917257f6469.pdfIn PDF document text
    • https://dunudafulu.weebly.com/uploads/1/3/1/0/131071166/kutunufupiwigin-vatidanukijir-zanaxu-jatal.pdfIn PDF document text
    • http://xabidewukolesas.66ghz.com/alien_shooter_tower_defence_mod_apk.pdfIn PDF document text
    • https://xabizukilitexe.weebly.com/uploads/1/3/4/3/134335342/misebidisafi.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/vukularamiwiwi.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/retegosoxeduviki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_5fd83e025d2de.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/vaneve.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/9504752.pdfIn PDF document text
    • https://putukaxuke.weebly.com/uploads/1/3/1/4/131437363/sikiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5ff9b71e9f323.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/kazakekoduli_sumiti_jitif_dozufejebiwiner.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fegozovot.rf.gd/define_bailment.pdfIn PDF document text
    • http://wokixewo.epizy.com/54257121041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8285f993-9b52-4327-9144-18985a48dd3f/47246839754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eacb02f6-9201-4d09-b138-1d904e171a14/venakafogurejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d508f299-32a4-45b0-9c95-e32e824f8ed8/how_much_is_citizen_watch.pdfIn PDF document text
    • http://kadimupekomo.rf.gd/dmv_written_test_answers_2019_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bf3531-93d0-4bf6-ba12-de27ccd0d568/how_does_wix_online_store_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3a2fc2-67b1-41d2-a960-c506357e6f67/troy_bilt_push_mower_fuel_filter.pdfIn PDF document text
    • http://jimanujomubil.epizy.com/aafp_isfm_feline_friendly_handling_guidelines.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_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 5724 bytes
SHA-256: c5c21d6d93147bca0c941bac754f8174ff0788a9b55eddab0fcc6e006d8a5fbe
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 10596 bytes
SHA-256: 4ef1e045807871529bd41564bb59330bc2610e95c94870a7dd155b0ae2028286

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