Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d38123cdf499d0…

MALICIOUS

PDF

60.4 KB Created: 2020-12-21 14:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d78c1bfaa744e0b615e8492fea6713ec SHA-1: 72d6759143e79749aa01be07e143ab98819c16a1 SHA-256: 48d38123cdf499d061bee2082b32ffff4bcbc065c6adada72ad244cfe2efc6a5
156 Risk Score

Malware Insights

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

The PDF file, disguised as a worksheet, contains a large number of external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites. While no scripts were directly extracted, the PDF structure and numerous external links point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=weighted+mean+worksheet+with+answers
    • https://jojavofeze.weebly.com/uploads/1/3/4/3/134395471/budasiwukuzola_tapepotizo.pdf
    • https://batebabegusuk.weebly.com/uploads/1/3/1/4/131437625/917661.pdf
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f8e8e2b6c4e9.pdf
    • https://zoximubovug.weebly.com/uploads/1/3/1/3/131379564/gimisumoz.pdf
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5f95d4f160479.pdf
    • https://cdn-cms.f-static.net/uploads/4382639/normal_5f9d916274db2.pdf
    • https://mitapesazo.weebly.com/uploads/1/3/4/6/134652839/3575808.pdf
    • https://livaganomin.weebly.com/uploads/1/3/4/3/134399079/4363042.pdf
    • https://nimorozidu.weebly.com/uploads/1/3/4/3/134373006/fogojo.pdf
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5fd11898b5eff.pdf
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/busivima.pdf
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/zojozi-rujarawekuritix-ponexolo-wagugifavofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9127384b-1f63-4b6f-8979-929cefe16a97/breadman_pro_tr875_manual.pdf
    • https://uploads.strikinglycdn.com/files/32ea37f5-b7f5-418f-bec5-99f410dbd790/13781513373.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b08c.bin
8f11f790b574345771624f795cb342e54c76e9301974510fe086373550e005d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB08C 5376 bytes
font_01_sfnt_off0000c2bc.bin
11c7b2771bc18442f6fc5da189b118d4893fc0e1646c764c1f45b51f504c2eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BC 9956 bytes