Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a28e9e1b32ba7d0…

MALICIOUS

PDF

78.8 KB Created: 2021-03-16 15:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c7453619a1598fec9e6cb82b620b0308 SHA-1: 4e89c577765e488d97e5ac431ba8668eb8afc5ad SHA-256: 0a28e9e1b32ba7d082dbef331c37c979185751dd843a19253b2b02b410be7f48
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a mass of external links, many of which redirect through an SEO link farm, suggesting a phishing or spamming operation. The embedded URLs and the heuristic firings indicate a pattern of distributing links to other malicious or SEO-farmed content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=harley+davidson+street+750+first+service+cost PDF link annotation
    • http://onenature.space/29636487843icnb2.pdfIn PDF document text
    • http://bestsaleshopin.xyz/jotopemakn6fea.pdfIn PDF document text
    • http://dokumenty-kiev.online/mofiriranadunemekukeuhi31.pdfIn PDF document text
    • https://natapoja.weebly.com/uploads/1/3/0/8/130813782/6745862.pdfIn PDF document text
    • http://naturebiolog.fun/heartburn_diet_sheetw3vxm.pdfIn PDF document text
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/9136029.pdfIn PDF document text
    • http://promoocaoameericanas.com/new_york_times_spelling_bee_game_answersi05lv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/chapters_interactive_stories_unlimited_diamonds_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/gaxogab.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_baeac8da9c9040158c6d08fa0270e87a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/27407950729.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/kiloto.pdfIn PDF document text
    • http://figupowogo.rf.gd/livro_candidiase_tem_cura_gratis.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_32205ab134d74002906fd1b9ad90e17c.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_1780169ed1da40f4b11b18939e7ded1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/96662472811.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_e56b1d1c04144c4a81c6971eedcc40a0.pdf?index=trueIn PDF document text
    • http://zopefunexot.epizy.com/command_and_conquer_game_free.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 5484 bytes
SHA-256: 69d5d1226655de23f80f188c92589fdffee0c4d6b826c06ec2aad4b8a68ca222
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 11028 bytes
SHA-256: bf988c1973b9c53097269782355c163c0bd82d10c9eed235dc01a296ac6bf249
font_02_sfnt_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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