Malicious PDF — malware analysis report

Static analysis result for SHA-256 710dbf3e61f75899…

MALICIOUS

PDF

74.7 KB Created: 2021-03-05 00:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: afe19d146d9d0fda60b8ac7431adf5a0 SHA-1: 6f083ffbc7f81cfa58fa06f2388677fd9a9eab76 SHA-256: 710dbf3e61f75899ebd5038101d70d28745842e7c7bc3f000cc9bee195fe7469
186 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 phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/strik?utm_term=toothache+so+bad PDF link annotation
    • http://lobulezinovux.medianewsonline.com/fudonixapijogujuvotunub.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/tufuzufagefiwexejikowe.pdfIn PDF document text
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/3631578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451949/normal_5fec14d41dda5.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/36134053625.pdfIn PDF document text
    • http://mimawusavap.iblogger.org/beelzebub_sub_indo_batch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_601e4e67a63e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_603a852ec1695.pdfIn PDF document text
    • http://copyrightsupporteds.com/swamp_attack_hack_download_ios99vav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477409/normal_5feb7b289f847.pdfIn PDF document text
    • http://artdebug.site/304640562398gdkq.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/45377682026.pdfIn PDF document text
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/2985708.pdfIn PDF document text
    • https://babexunerasosib.weebly.com/uploads/1/3/4/6/134620176/8065008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5ffb23808f569.pdfIn PDF document text
    • http://kamaz-ftc.com/69639771187bwu1k.pdfIn PDF document text
    • http://vuvuga.xyz/sadad_meaning_in_arabiccivqj.pdfIn PDF document text
    • http://raruvutemogogog.iblogger.org/lagu_seesaw_bts_suga.pdfIn PDF document text
    • http://world-wild-shop.com/sloan_flushmate_will_not_stop_runninggtp9g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_f27c5a0afd4b48e0a4dfdfe12671f587.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_57041e6890a24887b8f081d774f9e87a.pdf?index=trueIn PDF document text
    • http://pekafujojef.onlinewebshop.net/taurus_g2c_9mm_ankle_holster.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_9371d930b64c40cfaba65da87739a29b.pdf?index=trueIn PDF document text
    • http://kuzojepume.epizy.com/elkay_water_fountain_spec_sheet.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_5fbc8844bbc94aa797af9de652377674.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_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 4988 bytes
SHA-256: c610cf5dd3e0480b6fbfabf85f74798f21091e2fd1275be21db7c84eb70b678e
font_01_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 10472 bytes
SHA-256: 2a3334fc3c0c8885d84a2b55f6781062137d1ef524d83f896d766adfa800a750