Malicious PDF — malware analysis report

Static analysis result for SHA-256 644b28834c6b5b38…

MALICIOUS

PDF

73.4 KB Created: 2021-03-21 02:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c056f0554055d6f2cd05be83adeef5bf SHA-1: 9f65d599de6ed80d0a0878e62dd36efdeb662dd5 SHA-256: 644b28834c6b5b389a2a41705dc1ff5d71b2f464ebc19aa13d7a3637a5765376
134 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one pointing to a suspicious domain ('fokemale.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, further supporting a malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

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 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.
  • 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://fokemale.ru/strik?utm_term=best+rbc+mutual+funds+2020+reddit PDF link annotation
    • https://cdn.sqhk.co/datawafag/bLhjjjj/lightroom_presets_app_download.pdfIn PDF document text
    • http://insta-sale.site/wikemopwvi2b.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/db2VOhb/how_to_sharpen_chainsaw_with_dremel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_60528223eafec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384036/normal_5ff159179e9ab.pdfIn PDF document text
    • http://nimened.66ghz.com/tsunami_in_japan_2016_information.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427795/normal_5fff9ca140264.pdfIn PDF document text
    • http://info-pages.ru/how_to_repair_a_whirlpool_front_load_washer6cmye.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/jbhcOih/stick_shadow_war_fight_download.pdfIn PDF document text
    • http://good-production9.site/susofozuvogulow9ln2.pdfIn PDF document text
    • https://cdn.sqhk.co/kinerufi/G2gchaw/28156848371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480899/normal_5ff12f631c10b.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/gighcL0/snowflake_ipo_date_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407997/normal_5fd08c3cd9c16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b7316e-c79e-4b14-b71f-810bd961d58b/how_much_auto_mechanics_make_a_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a60a50f-e423-41a9-af67-667e20a839b8/72030924979.pdfIn PDF document text
    • http://xonifovozub.epizy.com/krik_krak_haitian_jokes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1903c9bc-b7d9-4d97-9fee-ac1a7278f896/pawogukekowivapovegodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b636429-1c21-482c-8450-db97c9cb6466/85957521476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4eef96-0277-487e-8e95-8a5a2c71664d/74483450030.pdfIn PDF document text
    • http://beluruke.epizy.com/tulotulavefom.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 5628 bytes
SHA-256: 24ee3daee8ccf24a200371a84fd81c92dad89f065d1b9dbb39069ccdc1edfb1c
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 10628 bytes
SHA-256: 67a0410e4cd40b669b237dfc5144234be26dd7e88e52af51aac60db04f56a416

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