Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb8664815537b38…

MALICIOUS

PDF

86.4 KB Created: 2021-03-28 00:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ab28eed6503d3a491e99aa1f874d7025 SHA-1: d9855adc71d5e7026c1908f4493fde5eb2f9d233 SHA-256: ecb8664815537b389c25a7d64a1a5b32d4f8d95ce122f3a8d561ec43a72ba7ff
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. The embedded URLs and the document's structure point towards a phishing or spamming campaign, likely using the document as a lure to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://nipisod.ru/strik?utm_term=the+moviegoer+walker+percy+quotes PDF link annotation
    • https://zagibekopawof.weebly.com/uploads/1/3/1/4/131453283/soselaritimag_zelavumu_ditilojijupu_gakiluvafevif.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/what_is_the_main_message_of_the_tell_tale_heart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_5fd36d016c066.pdfIn PDF document text
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/3029214.pdfIn PDF document text
    • https://ruvetuse.weebly.com/uploads/1/3/4/6/134618438/fijatabuto-fodexumewutepi-xewusurizi.pdfIn PDF document text
    • https://vilegewadaw.weebly.com/uploads/1/3/5/3/135324537/3860352.pdfIn PDF document text
    • http://dipitazifageb.iblogger.org/nanorigefowawafuwopoto.pdfIn PDF document text
    • http://keribek.22web.org/baldor_algebra_gratis.pdfIn PDF document text
    • https://kalokawagubur.weebly.com/uploads/1/3/1/3/131398574/7cf24d79a527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_605fab566ae20.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/representation_theory_book.pdfIn PDF document text
    • http://xepuxupipe.mywebcommunity.org/amazon_echo_dot_user_guide.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/aldous_huxley_espaol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipinajamidab.epizy.com/naina_re_song_female_version.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_096f464a02e1480dbe4d821145fa5b6b.pdf?index=trueIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_2010944708c749b6b74c1a007299833d.pdf?index=trueIn PDF document text
    • http://fidegaf.atwebpages.com/tivuvaburipunasusulubosa.pdfIn PDF document text
    • http://vubixijugisoloz.epizy.com/91899979257.pdfIn PDF document text
    • http://xuxamasisovuku.epizy.com/24117887974.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_efaf7ba34f864dfa9412449898dbb76c.pdf?index=trueIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_18cab7b484e84ac3973f8d8680b0a7cc.pdf?index=trueIn 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_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 5740 bytes
SHA-256: 1b8f1dc12674f07ab34ac215e27089d7263cac5df8266855743e1dafd9f48a12
font_01_sfnt_off00012757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12757 11028 bytes
SHA-256: 7c85a75941590bd2571110051cddfe59caa78534fc2e9a1a854d0eaaa770a62b