Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf0bcb7e0afa610…

MALICIOUS

PDF

73.6 KB Created: 2021-04-03 19:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4173123809ec4c6d4875690e84c48561 SHA-1: c340b28bb3f649a8b9003021732767e870a9e5f7 SHA-256: 1cf0bcb7e0afa6100abb0037355bb7f75aaa60242f7b97884b3412accfacef6d
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristic firings indicating malicious intent, including links to algorithmically generated URLs and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded URLs point to potentially malicious domains, and the document body, though heavily obfuscated, likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://golowaki.ru/strik?utm_term=how+to+write+best+selling+fiction+amazon PDF link annotation
    • http://vashastrahovka24.ru/jidobexotitox4xef.pdfIn PDF document text
    • http://nikecortez.net/nakinabewejowodiragizadibpvian.pdfIn PDF document text
    • http://ovca.space/dream_interpretation_of_dead_pet_dogp39z9.pdfIn PDF document text
    • http://salebox.shop/2262518111oqyt2.pdfIn PDF document text
    • https://xazefobilizap.weebly.com/uploads/1/3/1/3/131384081/jekisonavoxu_zoban.pdfIn PDF document text
    • http://rollernefritmassage.xyz/super_starfish_all_fish_20198hw51.pdfIn PDF document text
    • http://0fruit.space/ni_no_kuni_trophy_guide_ps4eiekf.pdfIn PDF document text
    • http://lolafoduluj.22web.org/how_to_prepare_certified_mail_form_3811.pdfIn PDF document text
    • http://markettop.pro/what_to_do_when_gas_heater_is_not_working0xilt.pdfIn PDF document text
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/ac7691b75c.pdfIn PDF document text
    • http://mimudobaros.22web.org/6834353034.pdfIn PDF document text
    • http://dronextactical.xyz/10118845070h15tz.pdfIn PDF document text
    • http://pixelbarista.com/dupegipuxeblret.pdfIn PDF document text
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/dobusag.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/4632f44c0a3b.pdfIn PDF document text
    • http://vekenuv.iblogger.org/pezeturuvepewolunufifu.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/21a920a3-e063-4b37-8ca1-cfcca22e8f45/68801171559.pdfIn PDF document text
    • http://lafatakijuton.epizy.com/80952002587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/664b444a-48b6-49f6-991c-c4a8a7d2cc76/1504390204.pdfIn PDF document text
    • http://sumafalonedap.rf.gd/63422823682.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_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 5444 bytes
SHA-256: a9a6af594a85ac8f374ea3832ec554f12339338278c0b1b264bd8d215325acc9
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 10180 bytes
SHA-256: 78fafab4a36b7812d5779b64a74427cc52852c4d381ce3ddb47ef0269a2ea43a

Open this report in the interactive analyzer, or submit your own file for analysis.