Malicious PDF — malware analysis report

Static analysis result for SHA-256 0180ab2e0ed36b61…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 10:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 253d3bfde6c4e3eb604fbcecded0d0dd SHA-1: fae943c9f38f96d2485aa8eddfc19737310b473e SHA-256: 0180ab2e0ed36b61fdcf58fd31dc981d1953be539b0789df2ec25119e0a850bc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm designed to distribute malware or phish for information. The primary URL, https://resalured.ru/award?keyword=recombinant+dna+genes+and+genomes+watson+pdf, is likely part of this distribution scheme.

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-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://resalured.ru/award?keyword=recombinant+dna+genes+and+genomes+watson+pdf
    • https://cdn.sqhk.co/fojevimexu/iZjiMge/mupakemafiduvak.pdf
    • https://wijugola.weebly.com/uploads/1/3/2/3/132303023/36cc061.pdf
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/ab0538.pdf
    • https://fiwigerisen.weebly.com/uploads/1/3/1/4/131408459/c9fd271ce09bf.pdf
    • https://cdn.sqhk.co/jakufomego/y8jfhim/stickman_warfare_blood_strike_unlimited_money.pdf
    • https://cdn.sqhk.co/mewixamok/HbhjQhc/movie_trivia_quiz.pdf
    • https://peguduzivinaw.weebly.com/uploads/1/3/1/6/131606374/6483814.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mepojijolotezud.rf.gd/latatizokup.pdf
    • https://s3.amazonaws.com/toguvaju/19322074854.pdf
    • http://fitagijup.epizy.com/poxenugoluzib.pdf
    • https://uploads.strikinglycdn.com/files/f862b087-d225-46d6-b3c2-06b10a0d250e/tebixazezipenopuroko.pdf
    • https://uploads.strikinglycdn.com/files/d5e2ba06-1049-41e7-bab7-70e73be0b005/282017809.pdf
    • https://uploads.strikinglycdn.com/files/41907c7f-0fcd-4fd7-963a-567e1c8641f1/manabadapekijok.pdf
    • https://s3.amazonaws.com/wikurixobelu/37323194656.pdf
    • https://uploads.strikinglycdn.com/files/8e4fb175-b852-4257-9ed0-8cd6300cc968/werifirajugubiri.pdf
    • https://uploads.strikinglycdn.com/files/0caf3921-f589-49bc-b942-bde43dfb8dcf/95831660268.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8c.bin
df9eb5065c99dc0761e24581c25986696f989bb883a9c557395c6d69ef194908		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 5588 bytes
font_01_sfnt_off0000ed9e.bin
9931d8b66e9a8b2cc32b4ec6d06e964d8c9baab6f5fef88b09df908421a4e63f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 10928 bytes
font_02_sfnt_off00011373.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 16060 bytes

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