Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5c367ca129ac45…

MALICIOUS

PDF

83.3 KB Created: 2021-05-08 07:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0d444b67b849e4789806de1be43f1a3f SHA-1: 62ca8b94bddc2f6daa409fb99a0a467447d2ca6f SHA-256: dc5c367ca129ac45a9e5ea7ae2d19848aaa5b25e61923076af52938d34c3863e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=the+norton+anthology+of+world+literature+shorter+3rd+edition+volume+1+pdf', are likely used to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=the+norton+anthology+of+world+literature+shorter+3rd+edition+volume+1+pdf PDF link annotation
    • https://cdn.sqhk.co/dusivubeleza/78ihiHe/fanijur.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/jjSEifm/paxobonizexunafukevanegaw.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/Kig3jih/fotilapimezu.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/yTjdggf/80399266901.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuwegijelo/3AidgfY/pubagirilopoli.pdfIn PDF document text
    • https://cdn.sqhk.co/xarobumevux/IUibihO/sound_analyzer_program.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/jejjvBJ/krabathor_orthodox_cd.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/atomic_physics_download.pdfIn PDF document text
    • http://waliduv.mypressonline.com/functional_abdominal_pain_syndrome.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://uploads.strikinglycdn.com/files/1f9b1c47-9d3b-4880-9d9f-404eb0c9fc10/tavujurigenewitizotov.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/99905024538.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_3e18fbd82fc841f6966b8839583da8f8.pdf?index=trueIn PDF document text
    • http://rabelinowizufe.myartsonline.com/o_level_biology_notes_uganda.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_b59ca0864bc243eebd218bf5b5590932.pdf?index=trueIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_7668bccc834d4519b3fb8ca473c94a5f.pdf?index=trueIn PDF document text
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_610a5a53ebf448629c722eb1119565ca.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_646174b6af0b43a288369a05ea6a1928.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_6acb0e18de0a4c8d9879c1da1f0f3286.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_4bf63d47473644ecb443ce98ae369601.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fa1553-371b-49b0-97ad-c766605914a1/16476576234.pdfIn PDF document text
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_6e421956d28b4b0794d257a6d4dc6456.pdf?index=trueIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/rexaruxoxovuzubosum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10495588-b66d-4cfd-9299-7fe6467c2979/46368286014.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 5756 bytes
SHA-256: 3689ad7821f8634606d8fd2a00c33fb76328970bb37c4acc0e93b8a2de35a27e
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 12212 bytes
SHA-256: 6adc427d5a643a9bb623d7ee887098c0c05de4e8ddaf3d504946654dfc2ab590
font_02_sfnt_off0001306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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