Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a344d3355c2cc3…

MALICIOUS

PDF

74.3 KB Created: 2021-03-29 02:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3a7c8ada14ebe576fa02c9710b614c19 SHA-1: dd4559d1884e7ef8e7dd13d5b19cb3c5d41bce72 SHA-256: 66a344d3355c2cc3d466eca9c803a53dbba111e20fdd52294e59a91fb5241e9d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links to external PDFs hosted on disposable domains, a technique often used for SEO manipulation or to distribute malware. The presence of a link to known malicious redirector infrastructure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=starcraft+guide+book In PDF document text
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/nivogugo.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/ZLifMje/zigaxajiz.pdfIn PDF document text
    • https://mibebedobosuv.weebly.com/uploads/1/3/4/3/134322580/71ffdecf1aa40.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/gIheaha/articles_on_blockchain.pdfIn PDF document text
    • https://jirakeleda.weebly.com/uploads/1/3/5/9/135992973/98a9bdeecd.pdfIn PDF document text
    • https://lebugaboforov.weebly.com/uploads/1/3/5/9/135976333/bimewar-diroridudapuz-lebuxixi-zixuv.pdfIn PDF document text
    • http://fajamad.mypressonline.com/tijosepepaloz.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/c878a28fd4101.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/bebukamomaramuju.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiwuximu/Dje1rWu/campus_date_sim_exclusive_photos.pdfIn PDF document text
    • http://dezowem.medianewsonline.com/architectural_plans_for_houses.pdfIn PDF document text
    • https://nevimemiwuje.weebly.com/uploads/1/3/5/3/135332714/0ee0fbf.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/Ehaiehj/silicon_valley_bank_jobs_glassdoor.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/40995.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/gijhhcA/covid_19_new_infection_rate_by_state.pdfIn PDF document text
    • https://cdn.sqhk.co/morexemodoju/bigZhbu/fesukegewadope.pdfIn PDF document text
    • https://cdn.sqhk.co/kovajivika/YmjbrUT/6070750154.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/gjhdjds/76752484684.pdfIn PDF document text
    • https://mutuwafidiz.weebly.com/uploads/1/3/6/0/136095616/sabowatematekesakap.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/IicRDij/rurat.pdfIn PDF document text
    • https://xinotetul.weebly.com/uploads/1/3/5/3/135351743/98321cf38.pdfIn PDF document text
    • https://cdn.sqhk.co/fifusaji/Q0XbjgN/fexonilud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a343e978-325f-4d17-850e-1abf78dab1be/jimigoxilejazakebig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8270a6-5cdf-4d0d-9b6a-404208e3fa15/zogarepotetoturuvugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c002e1a0-3c14-4f32-9235-df958b5551f8/book_review_of_who_moved_my_cheese_by_spencer_johnson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107c894a-5263-4e14-b666-b364b90e2320/how_to_flying_lantern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6251f38a-91d4-4d1f-aea7-eb4b8dbd2018/central_route_of_persuasion_psychology.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/xoluzedixuwil.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/past_perfect_simple_and_continuous_worksheets.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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 5288 bytes
SHA-256: 580f021693a708ab943b5c1d8c70a540c1216cb565a1b01aa439a3275d4099a7
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 10868 bytes
SHA-256: 787c2cec68b30fd5584875d60cf2ed510f78d81273e9b48f1737749c01882817