Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3790e05b150ea9b…

MALICIOUS

PDF

74.2 KB Created: 2021-04-05 04:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cf067a18081e9ff20bd6cc3ee7d4acc SHA-1: 29790288803989a4ae281b621191344bcff744f2 SHA-256: c3790e05b150ea9b94a63d6a0feb8f24b3da0772d5cc6cb3677d130752f9bc25
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or phishing attempt, with one URL specifically targeting search engine keywords. ClamAV and ML classifiers strongly indicate maliciousness, identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=factors+affecting+fetal+development+pdf
    • https://bigakajufejala.weebly.com/uploads/1/3/4/2/134265656/dajeratarimax.pdf
    • http://lupazul.mywebcommunity.org/american_english_slang_dictionary.pdf
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/roluta.pdf
    • http://raxewaponoxiv.mygamesonline.org/88390367739.pdf
    • https://cdn.sqhk.co/dafibuxoki/ificjaU/zekivezux.pdf
    • https://kodabovoxalomas.weebly.com/uploads/1/3/5/3/135340354/renoxutose.pdf
    • http://tezuveripoxub.mypressonline.com/jesaxuv.pdf
    • https://cdn.sqhk.co/xakelafu/HUsjbTO/fukakexejanoduzevorelo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jujadodedaruxix/xudemonebujavape.pdf
    • https://uploads.strikinglycdn.com/files/148e8491-5606-458d-86af-b9c039e099b8/97330433766.pdf
    • https://uploads.strikinglycdn.com/files/8536d640-2b20-4db9-9688-a481ad1d68f2/66702759250.pdf
    • https://uploads.strikinglycdn.com/files/847b54ef-e47e-40ab-842b-862ba56a3c79/zivolope.pdf
    • https://uploads.strikinglycdn.com/files/b9b4debc-61e6-45ec-9fba-9fcf176c79d8/10605263417.pdf
    • https://uploads.strikinglycdn.com/files/a5e8ca6a-7c62-4041-82f5-e1723cbf2ef3/fifty_shades_of_grey_book_review_quora.pdf
    • https://s3.amazonaws.com/setaxilitozuko/turtle_beach_stealth_500p_mit_pc_verbinden.pdf
    • http://mojogoralil.onlinewebshop.net/85751922571.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_off0000e5ce.bin
32d6e41ba1b6d6aeb64f909232ee2ffc869fd854f797227011d1e732d06f5674
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 5488 bytes
font_01_sfnt_off0000f875.bin
dc43e7674d1e0a9057d43418b5df2c22049b6a9060769336a03ceb458c6c11e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 10272 bytes