Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f7784d8d0280d0…

MALICIOUS

PDF

75.4 KB Created: 2021-01-03 14:18:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4a3e3542f7cee81fb474fdfa8002f4ea SHA-1: ca3d42793ddfd07987ddbd991f5d3cf9e3f092cf SHA-256: 42f7784d8d0280d0b2097b89a3ab44dc087d1c892c5ee7f6fa0ea8323f343aa8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://traffnew.ru/aws?utm_term=extra+deep+pocket+sheets+king+size+bed PDF link annotation
    • https://fusefediwotedi.weebly.com/uploads/1/3/4/5/134589876/bivawo-pafidemop-pepaxurerabon-gugoma.pdfIn PDF document text
    • https://cdn.sqhk.co/nijegonusas/id1rhbR/gupigiri.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/1qiehjP/basketball_stars_miniclip_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/RQefTcC/inside_out_anger_meme_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/IhdyIEN/jifebafetogudisufutuget.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/2Ev4ngj/viking_ocean_world_cruise_2020.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/88f7f22.pdfIn PDF document text
    • https://cdn.sqhk.co/libarazituw/oXAggiF/jebaturusufikigujixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/acog_endometrial_hyperplasia_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f923634-670b-4e6d-a804-0bcc8d3df267/lugifo.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/bukum.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/soundcloud_link_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/4144200139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94de0c6-0900-48d9-9f80-956082386bf6/nezomojoramit.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_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 5584 bytes
SHA-256: 48ebc14cfd63571865ae950140a71743719ca7421dc77e883afe74596e6dea31
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 11000 bytes
SHA-256: 4d3d7b756dc8c6a254073981da7f3673710e21f99eab919870fd8ed84a8227da

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