Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec38c3af38eda81…

MALICIOUS

PDF

81.0 KB Created: 2021-04-11 20:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 63396f2164627b15b3ff1c561b0fb050 SHA-1: 17e907c89c2976493d7fc4b082e7a345aca6b44f SHA-256: bec38c3af38eda81815865c568c8f83b03f5fb56cecb27ccd2c6bdf3864ab44d
176 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=is+the+president+day+a+federal+holiday PDF link annotation
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/wiwan_forobigige.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/PAhd4gd/large_button_cell_phones_for_seniors_canada.pdfIn PDF document text
    • https://legokozupanodul.weebly.com/uploads/1/3/4/4/134492876/janusogebokowa_lixijasitovuje.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/ew5giR1/prison_architect_mobile_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/ayCjdw4/rc_plane_events_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/jejbaTI/yakima_theatres_food.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/wekibik/98744291334.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/360_degree_camera_app.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/42148372147.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/ferocious_cup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/pidojuxagedikavalifu.pdfIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_8e864c4db95f406186a12623e38233d6.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_86193ea8cdbf48faa43f0ac182fae781.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/5595008973.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_14da9af48c914b949325be32187f4e2a.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
    • 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_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 5168 bytes
SHA-256: e834e912c81d121edc1847b68645ff0ed38c38a22f98c5ecab3987bcc3e6f97a
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 10924 bytes
SHA-256: 84f8210bd30f3f80d6feb8b57a2cdc6d427bb3739154874878e68c1c07907598
font_02_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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