Malicious PDF — malware analysis report

Static analysis result for SHA-256 f044a8bbfe7c0268…

MALICIOUS

PDF

79.0 KB Created: 2021-03-21 04:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 13fc87f22d88b4a0529f3895eed398d5 SHA-1: fea74f200b044ef40534e7b9617971676ae89d2c SHA-256: f044a8bbfe7c0268ca0d294474341668d3503b3d91cab16611acc5ecdd214eb2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malware or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://dugedepap.ru/strik?utm_term=where+is+the+filter+on+a+bryant+plus+90+furnace PDF link annotation
    • http://spiritstudio.ru/94628032902pmvvx.pdfIn PDF document text
    • https://feveronibamuja.weebly.com/uploads/1/3/5/3/135300243/2634237.pdfIn PDF document text
    • http://meweremidef.iblogger.org/fipizopovutonaxod.pdfIn PDF document text
    • http://durofuvixari.22web.org/satakovejirawepudefaja.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/9550303.pdfIn PDF document text
    • https://nusimilanagazi.weebly.com/uploads/1/3/1/4/131454102/1308650.pdfIn PDF document text
    • http://reabook.online/pixozowabubodekewowo7mruy.pdfIn PDF document text
    • http://puwonasomoso.22web.org/numut.pdfIn PDF document text
    • http://info-pages.ru/pidijunujay3b87.pdfIn PDF document text
    • http://datab.vip/digital_rebel_xt_battery1ygvn.pdfIn PDF document text
    • http://itdiscounts.info/shark_navigator_vacuum_replacement_partsctnhw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_65f0b4a339804badbf2cbdee3e367e6c.pdf?index=trueIn PDF document text
    • http://jerasopel.epizy.com/how_to_put_mp3_on_iphone_without_computer.pdfIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_a3a11000125a4da6b91e47cfc7eb4d7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/viraxiwekoviwonodute.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_f8f1de80b11c47d1b528a2564119f4c9.pdf?index=trueIn PDF document text
    • http://diveruwafulebes.epizy.com/sobosotemeboxuz.pdfIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_cd26d1860ca3440eb6cd815532462692.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_33ad8809547247f2b42c9ebf1e9de5b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/begijufadi/63770402267.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_99ce3bd734964942a8d9fd54dc7004e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/3936050196.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_60dffab0761c40cdbd1667ef6a4b81fb.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_cb12586141c444c38c79bf4062541f3c.pdf?index=trueIn PDF document text
    • https://a9b7993f-6967-48c1-a2c3-d5bc86fe985f.filesusr.com/ugd/ea2be3_34f2feb2f2a24e249a2f5ed020e1c362.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_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 5656 bytes
SHA-256: efcf9ebfedbbbc934301e1f9b471e6b0c353de37571c21d0b9a39a238c300a4f
font_01_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 11004 bytes
SHA-256: 6856b461746b22a54f3412e07134a67e333094aeb40569a92f661d198903884e