Malicious PDF — malware analysis report

Static analysis result for SHA-256 042e3a7255d3c62a…

MALICIOUS

PDF

73.8 KB Created: 2021-04-07 22:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 322b224ba100bfcbea896569c4a3073b SHA-1: 7063900769f78e15da69fdf1d9e2e8c5d4c52dca SHA-256: 042e3a7255d3c62a898e580d048180fc15397df63b135e9687eb831f568687c1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=fear+itself+book+of+the+skull In PDF document text
    • https://cdn.sqhk.co/gibuburi/Osjejft/90132615470.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/YQTjdje/fegudewolowonaxugidibes.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/hhFjbje/59536129302.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/eHZFBhi/superhero_fight_club_2._0.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/latufenaw/zesaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa96e88-e349-46cc-9d01-a9b29368ec41/gaderusipulomule.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/chogada_flute_ringtone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/22767284604.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/39982540847.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/84954874653.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/venn_diagrams_in_word_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276cd809-ceb3-4be0-a6f7-1f7bc6fd12a1/lebokavarasebinamapife.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/75958946670.pdfIn PDF document text
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_a9abc35264724419b57709862a3993f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/14909812334.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/49245940997.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/42540961591.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_02444b19dbaa4adf87eb2a27dbb702e6.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_4867b087f44f40c7ad4a0bea1bc989e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e433ccaa-3b58-4385-84ef-7bdeb566451c/bapel.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/hero_s_journey_outline_template.pdfIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_063cf88188f84d83ba8dd1a5c1db5074.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_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 5016 bytes
SHA-256: 456bc0510cc5109646b40752a6bf1f0d19839398465c1a5bc0ee7c46ac3b129f
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10884 bytes
SHA-256: 1463f886a64ba9a5a46df59a6eec2a234e07e2086f1587dcd588224f8745451a