Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abcc7b847fc99d7…

MALICIOUS

PDF

60.6 KB Created: 2020-12-04 20:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 40d3b80c82706b60e8c5e713e54daf00 SHA-1: 9bacaaf33746ea06c4dbd1c638ed356358b1df47 SHA-256: 7abcc7b847fc99d7b78c3dfa8c22c7cde17b88894c45d9d89a331e69e1d2582c
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains a significant number of external links, indicating a link farm or redirection strategy. The primary malicious activity observed is the embedding of numerous external URLs, likely intended to direct users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=amine+400+mixing+instructions PDF link annotation
    • https://jefogozadiz.weebly.com/uploads/1/3/4/0/134040800/6657137.pdfIn PDF document text
    • https://zazukorowoko.weebly.com/uploads/1/3/4/4/134488568/6686199.pdfIn PDF document text
    • https://buvijolijesikuv.weebly.com/uploads/1/3/4/6/134602818/d5abb983ab8a1f.pdfIn PDF document text
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/1244682.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/888206b8-e14e-4947-ab47-45bfae09c0b3/glanzer_and_cunitz_1966_original_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120cfbbe-3dc1-4e89-9d53-1ffca9f91283/the_three_stooges_spooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47876f82-6000-4985-bffb-16ab59be2440/athlean_x_bodyweight_workout_routine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c518a1-0cdf-4064-81d9-04939b9a891b/anno_2070_tea_layout.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc532e1bda9c57a97da3ebd/t/5fc6d059ad3e64119231fb38/1606864986502/tilakuzusitidiwenavojivef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495a2a91-ccac-417f-8a39-dfa8fbdc98db/14936741140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84803ec-2ff3-488e-8c24-923b4099e507/miwiriwux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/994d8959-5db3-488c-bff7-a8aa216d3928/gisonugurofasidefove.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5729540f1034a5cc777a2/t/5fc626c1f3de5e49b53731c5/1606821569721/biwedabemisufaxegaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b167014-7bc8-418f-91bd-de44a0e15246/round_robin_parlay_strategy.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_off0000b2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B0 5164 bytes
SHA-256: 8696b897c696d1f328bd734899b1f2da07abc997579d4abc2f6a4c6a74ba74df
font_01_sfnt_off0000c441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC441 9816 bytes
SHA-256: 5e722b4070917238cdc721484e23575affe3c7ff2269f2beb1aaf0abfd0b33cb

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