Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c595d389b3a5c0c…

MALICIOUS

PDF

89.4 KB Created: 2021-03-15 00:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f02e195c834b10ea5d07c21d7b0c007c SHA-1: 569e701e2ddc0014590f576607267638a7564f0a SHA-256: 4c595d389b3a5c0ca882048c847256edeb8a72a080c5abd7b3e54cb5092cc0c9
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=an+inspector+calls+play+pdf PDF link annotation
    • http://viewcreditscore.info/67933973230vl5tx.pdfIn PDF document text
    • http://gigurokubi.66ghz.com/69476921709.pdfIn PDF document text
    • http://fazoluniguket.iblogger.org/symbolic_interactionism_joel_charon.pdfIn PDF document text
    • http://fresh-ita.fun/gangster_wallpaper_girlfz6yr.pdfIn PDF document text
    • http://sodaapp.club/jafupifebuhvj81.pdfIn PDF document text
    • http://mastera-saydinga.ru/dell_u2515h_monitor_driverjxgon.pdfIn PDF document text
    • http://vinnipoh.space/14678282540mwrbk.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/0d5c0413-504c-470c-8918-7b1d9da9d426/what_is_a_bill_of_exchange_in_banking.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_742a1807ccc840f8ad4d5afaa7ce4cd6.pdf?index=trueIn PDF document text
    • http://ruzawibo.rf.gd/pdf_to_word_convert_i_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/767ceaac-4c00-41cd-9540-40d9ec16d020/wavufarowumizofakubib.pdfIn PDF document text
    • http://temidegizesoweg.rf.gd/how_to_get_obd1_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d346f44-951f-4ca2-9ea5-af4682c67c3d/java_swing_guide.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_3b1834e0f4a84849975553bf07727a39.pdf?index=trueIn PDF document text
    • http://visowazugib.rf.gd/junerigojigewixakekodet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1311ea7d-b290-4f98-96d8-a89d1a6fbbbd/if_you_roll_doubles_in_jail_in_monopoly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8752e4-b6a2-46ea-9a7f-a1ab07550725/vuxugukotoxugizilewilima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299c45ef-83f7-4076-96f5-75f8384c6005/tintin_cartoon_full_movie_download_dual_audio_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45bf3c8-4046-4a4c-9181-b4376e920111/suseludugumanagirevu.pdfIn PDF document text
    • http://zigexejumex.epizy.com/86228730518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c882c2ad-9e8b-464a-b69f-ef12186fb036/fugalizuvodiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2719c075-6675-45c1-9abd-f4ff683b3bdc/funazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff19b1dd-de97-48e4-9a12-b50724ee1bd1/34137791286.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_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 5240 bytes
SHA-256: 11817c8e309115f944dda5496f381d72d4d3faf4f80823396fa2e49f6b1d103b
font_01_sfnt_off000131c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C5 12120 bytes
SHA-256: 35e7f78c36f3df713d2ffab491100b36e5a61a08a0f55178689ba4e0f3a5fec1