Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6c2b29a2f81cb0…

MALICIOUS

PDF

82.9 KB Created: 2021-03-25 00:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5a96ecf89279d11c6bdea8beb0379610 SHA-1: d884e89517b2c68dc5b129f38ce4829e41b389f1 SHA-256: 1c6c2b29a2f81cb06eb3ddaa7008bf223755cd14d87b00006b554bbf7f1d05c1
204 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm, and a specific redirector URL pointing to a potential phishing lure. The presence of a 'download button' heuristic further supports the phishing attempt. While no scripts were explicitly extracted, the overall structure and heuristic firings strongly indicate a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=efca+operations+manual+pdf PDF link annotation
    • http://tanemazijafawin.medianewsonline.com/mines.pdfIn PDF document text
    • http://jokojevuwurepip.22web.org/81723892816.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/6866160589.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/besafefaf/golds_gym_treadmill_480_control_panel.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_00485f34de1749e5b657bc3b0e8dcd42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/warm_bodies_movie_free_mp4.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_7496b05521db40388b6e6ccd1e4c2a99.pdf?index=trueIn PDF document text
    • http://kowelakava.rf.gd/charlie_movie_bgm_masstamilan.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_1d713aeac6db40758d7ee64f104c0869.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazovugal/baby_shower_invitation_templates_photoshop.pdfIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_adec7db4f99542f1b3db8c62e581c8d2.pdf?index=trueIn PDF document text
    • http://toxalotivip.epizy.com/magnum_inverter_repair_service.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/risewe.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_bd5760f8929545fcbb5323cfaecedc03.pdf?index=trueIn PDF document text
    • http://litorow.myartsonline.com/makkar_ielts_speaking_may_to_aug_2020_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/4096430881.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/92815314427.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/15328979337.pdfIn PDF document text
    • http://xetitonaj.rf.gd/63158585369.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/the_white_princess_season_2_episode_1_watch_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/dapanu.pdfIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_d7f6340e78d94fc9b5138ddec1f88184.pdf?index=trueIn PDF document text
    • http://suxazetevuzo.onlinewebshop.net/solved_quantitative_aptitude_questions.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 5140 bytes
SHA-256: 8a82976d79b9a5cd8cda523e9aac6a1a4f726dbf9d3c76c87da5c79b82af2e88
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 11048 bytes
SHA-256: 355b276c453887eea86162b41c73efaf3166ebc4913c8086d7f531fcc55e11b6
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00012e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E37 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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