Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20c15ea24c5fb5a…

MALICIOUS

PDF

80.5 KB Created: 2021-03-25 04:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ae60225e233e3b4637eb7c3a4a91c233 SHA-1: 8937c220ae73d898a4fb240392a39e9fde88b976 SHA-256: b20c15ea24c5fb5a0564b1f0c51c74c62a726b04aa1526d7f023470935810be8
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ML classification and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous external links, one of which, https://jottigo.ru/strik?utm_term=nys+defensive+driving+course+test+answers, is identified as a redirector likely leading to a phishing or malware site. The document body, though heavily obfuscated, suggests a lure related to 'Nys defensive driving course test answers'. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=nys+defensive+driving+course+test+answers PDF link annotation
    • https://cdn.sqhk.co/fevivesuxofo/w4vgJjj/36299632996.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/hAShehe/slice_of_heaven_restaurant_jamestown_rhode_island.pdfIn PDF document text
    • http://fenarumobajixu.22web.org/spiritual_meaning_of_609.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/jihcNWy/xezugorebawamazexupusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nisoxow/giorno_theme_virtual_piano_sheet.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_041b5b1ba4674d4daf70efd97a864099.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_fdeb9d816cd54a33b29fe7c9678f03cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/76978082516.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/rawiwigepitebi.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_c147ce5e428944fbb44e17ba32c6229e.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_d90df8d29d01411fbc3c65ac7b62784a.pdf?index=trueIn PDF document text
    • http://zefofipavefo.rf.gd/mapotid.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_9d80ec83810c4e01847a028a9901fe0b.pdf?index=trueIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_92c180ad7c1245f8967c03fa79be9bc6.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_cb8497e0d64e4a9a95845f2cc355fc2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rejiner/lasko_tower_fan_e20739_manual.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_ac2daf4fc3294d7ab55a6ff8dec23aa9.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_141e02cc59654aa8863bce86e681479c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mijumomub/lodash_template_function.pdfIn PDF document text
    • https://6dd05bf8-a32e-4ce7-8057-9a1894012cff.filesusr.com/ugd/4ce960_cb5e937cbfe940948790ab1f83273c20.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 5260 bytes
SHA-256: 604247f935188698fe30d269e3fcfd036696160e0cd3819dfaf3f6b98a9a7482
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 11000 bytes
SHA-256: d573cda3573c041b76addd3dee2f5fd72316ff9adab9c8ed8e09bef029f5d65c
font_02_sfnt_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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