Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6c62d22a37f638…

MALICIOUS

PDF

112.6 KB Created: 2021-03-21 20:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d7280d6b9891e2e7aff4131380faf07 SHA-1: 2535e454a2a18127db4582fd7b594fcdf07a81e3 SHA-256: 4a6c62d22a37f638e3eff878ebf1f9816153d27bbc48509117a8b739e0ecfe0a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://maypoin.ru/strik?utm_term=rifts+sourcebook+one+revised+and+expanded+edition PDF link annotation
    • https://wawanuxofidote.weebly.com/uploads/1/3/0/7/130775818/6b1a17f.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/american_history_test_2_quizlet.pdfIn PDF document text
    • https://kiluzamomumu.weebly.com/uploads/1/3/5/3/135344913/2872062.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_5ff10bea0de51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405687/normal_5fe0ff6547a16.pdfIn PDF document text
    • https://tiletemilowa.weebly.com/uploads/1/3/2/7/132710791/1979666.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/59264276596.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/55781822760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_604febfdc6197.pdfIn PDF document text
    • https://cdn.sqhk.co/ruradavi/c1iiQgc/disorderlies_full_movie_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426072/normal_5fe2ae2354183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_60565f53a76d8.pdfIn PDF document text
    • https://lirisuvobuku.weebly.com/uploads/1/3/5/3/135399047/zutopisitelepe.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/ie5n9Ta/bottle_shoot_game_download_in_jio_phone.pdfIn PDF document text
    • https://nuxilovu.weebly.com/uploads/1/3/4/4/134479446/pegisenofu_zawegadewo_fuparukapikize.pdfIn PDF document text
    • http://lefavapexusa.iblogger.org/maxezevava.pdfIn PDF document text
    • http://vedivux.mygamesonline.org/percy_jackson_and_the_battle_of_the_labyrinth_chapter_2_summary.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/8cd13bcc-b747-4414-850a-60130c46ced9/57393438895.pdfIn PDF document text
    • http://gexovegamone.rf.gd/vasudevan_biochemistry_free.pdfIn PDF document text
    • http://lejapanuvijul.rf.gd/all_the_way_up_remix_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743ba01e-cb1c-4933-bf23-0276009a91fe/muxejegufapumofobanoz.pdfIn PDF document text
    • http://vuzuvasukix.epizy.com/the_midnight_man_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc3c09e-45c9-444e-8095-5fe1ff42df6d/casio_ms-80s_set_tax_rate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838ddb6a-8f20-49e8-83de-b0067a4ebb4c/fobemeburixejeju.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_off00017a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A67 5456 bytes
SHA-256: 40fb675c6f022df881179026728a25261fae1ba7b9ac577ff988c467074f3b59
font_01_sfnt_off00018d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D16 11540 bytes
SHA-256: 23b63181b1fa792a9bfc0b59d0ed204a25f30a84513612666914526a17c2b100

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