Malicious PDF — malware analysis report

Static analysis result for SHA-256 c288ac5dbae1ace3…

MALICIOUS

PDF

79.4 KB Created: 2021-03-23 11:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5033f35b63abc8c6640a76ea23d39f21 SHA-1: 541e8b3e39c1e947c3af05dd50af844c763209db SHA-256: c288ac5dbae1ace30007ba219bc3d0396b2b0768b7e30fb5dda60fe33a726872
146 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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.
  • 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://botokaw.ru/wix?keyword=chase+order+foreign+currency PDF link annotation
    • http://tesekiwig.scienceontheweb.net/understanding_cultural_diversity.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/11965044882.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/ysbIhgx/daily_machine_maintenance_checklist_excel.pdfIn PDF document text
    • http://tdsevsvet.ru/91619224831rwbci.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/fig0iea/download_lagu_alan_walker_greatest_hits_full_album.pdfIn PDF document text
    • http://maxist.ru/dell_inspiron_15r_n5010_drivers_for_windows_10_64_bitrb10w.pdfIn PDF document text
    • http://espaceabonnes.com/66463727951szzb3.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/wujegutugitiganedojidixi.pdfIn PDF document text
    • http://qrastenmap.online/kowirofibotkdaic.pdfIn PDF document text
    • http://idealica-ufficiale.site/baltimore_county_code_violation_search65rap.pdfIn PDF document text
    • http://devlp.design/calculus_of_variations_functional_examples1jqpk.pdfIn PDF document text
    • http://sanelobazigi.medianewsonline.com/biodata_format_for_college_students.pdfIn PDF document text
    • http://roserubusigiwij.mywebcommunity.org/ncaa_division_2_basketball_regional_rankings.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/f3e43336-b43a-4dcd-94c9-c5c3fa273f96/cuanto_son_250_gramos_de_harina_en_ml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0663e5fb-e4b3-4d4a-8d8b-bdfb3038ef07/90626659625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2999e193-004d-4db0-a6ac-40d8f64ec13b/fitokujufakosipuvasuj.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_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 5176 bytes
SHA-256: a2f3fabeec21d653338e0b8eed9ab1c54d6f1d33ed01fa4a498b922ebc9ad80c
font_01_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 10784 bytes
SHA-256: 342a7d67e8680e642efc94fa4fd6f84e2bcbc8c32731643d59692623c0134069
font_02_sfnt_off000122b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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