Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3896628f868d994…

MALICIOUS

PDF

71.3 KB Created: 2021-05-31 17:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b700f77daaa04fc738be8fd8748411be SHA-1: 7e45bdcc8bd62f31b3505babd1cb2e7cad76746c SHA-256: a3896628f868d9943614d66de1e99f4409556b20545256ef629f7c8aa89f9b43
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/pbw?utm_term=how+to+enter+bios+b450+tomahawk+max
    • https://rumirasikimuzib.weebly.com/uploads/1/3/2/7/132710795/xiragisilamunedizuli.pdf
    • https://jipunelokafup.weebly.com/uploads/1/3/4/1/134109215/roweponosewabi-vobogotu-gogesakel-wenopakafagomu.pdf
    • https://dodawuwaxa.weebly.com/uploads/1/3/4/3/134305805/6098586.pdf
    • https://nubusoduzotuf.weebly.com/uploads/1/3/4/8/134883140/duzekut_xuxaf_wepaxebozetur.pdf
    • https://piramejujidizek.weebly.com/uploads/1/3/4/6/134694247/minowepafajo.pdf
    • https://latijivetazemor.weebly.com/uploads/1/3/0/7/130775002/timetufuxol-muzog-kivojixutij.pdf
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/novetuwow-tepabenemitiv-nibejaguwemaxe.pdf
    • https://sakedupepig.weebly.com/uploads/1/3/4/3/134355988/9262352.pdf
    • https://jejegufixi.weebly.com/uploads/1/3/2/7/132740716/ea8f614.pdf
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/lobawoso_visegu.pdf
    • https://gijegemolu.weebly.com/uploads/1/3/1/3/131380899/lejafaxepirivos.pdf
    • https://golobixapisiz.weebly.com/uploads/1/3/4/6/134653183/nuxefopeserukijos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7cb5881f-c038-4a7b-b862-a582d1a71537/lawupapobetavuwilitemetav.pdf
    • https://uploads.strikinglycdn.com/files/fa0eb777-2740-4369-a207-68f336f5cdf7/29562303674.pdf
    • https://uploads.strikinglycdn.com/files/a2678988-9a8b-4a73-ad81-172915d42a18/what_does_service_level_mean_in_a_call_center.pdf
    • https://uploads.strikinglycdn.com/files/e7c5d9a8-f736-46f8-bcf7-43859b6a3185/what_is_sonic_ocean_water_made_out_of.pdf
    • https://uploads.strikinglycdn.com/files/f221f4a5-fb38-4ef3-a377-3568166ef8b7/how_to_use_emotion_wheel.pdf
    • https://uploads.strikinglycdn.com/files/bae5f53d-08d1-4c38-9da4-ee26def02deb/john_grisham_books_in_order_uk.pdf
    • https://uploads.strikinglycdn.com/files/fc71f09d-b32f-443a-beb0-07a99c87daae/zepozifopapaladepojaxemuf.pdf
    • https://uploads.strikinglycdn.com/files/61d5f2f3-be8b-44be-998b-26865176530d/37742136205.pdf
    • https://uploads.strikinglycdn.com/files/376e1be3-42f8-4344-a3a5-eea4bb6de289/why_is_the_book_called_seedfolks.pdf
    • https://uploads.strikinglycdn.com/files/17c501a9-922c-4485-a119-f2ef3fc2146b/38552916836.pdf
    • https://uploads.strikinglycdn.com/files/13fa9512-4c4a-4c56-ade0-67f0beec2001/husqvarna_725ex_oil_type.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_off0000d926.bin
68c93dad50e18a9a95f962cdf59e0389b14a5983a7d485d6daaf966dc7e29fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 5572 bytes
font_01_sfnt_off0000ec0a.bin
eab1f8a63dc2a4758d1b015b769b4b11bab44524ab3d55d112bf8dd1307c028a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 10408 bytes

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