Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc98ee78eb3a0e9…

MALICIOUS

PDF

75.8 KB Created: 2021-04-20 22:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f9b7a90662c9ce599c00e950eb03c6f1 SHA-1: 9ccf652b7962b167c99f691731220655ea7a2062 SHA-256: afc98ee78eb3a0e9b54da63f72afd66dbdbc449a0ef5381fbfffa71d92e05a7a
126 Risk Score

Malware Insights

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

The PDF document contains a lure related to changing a safe lock box code, which is a common tactic for phishing or malware distribution. The presence of numerous external URIs, many hosted on disposable domains and identified as a link farm, strongly suggests malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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=how+to+change+the+code+on+a+sentry+safe+lock+box PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412388/normal_605bea338b222.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/Eahcbhh/19795156462.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/DsTHhby/dunia_games_top_up_ff.pdfIn PDF document text
    • http://arevakar-travel.com/gaxanugatawopirufumavigi5s0d6.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/2idiaji/download_citra_3ds_pro_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/velomegu/fjh6gcx/zexepogesalepezidek.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/tipos_de_archivos_linuxxlhvl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_60629dfc351d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487622/normal_5ffba613c0a9f.pdfIn PDF document text
    • https://cdn.sqhk.co/rijuratin/aBCLqih/94061114414.pdfIn PDF document text
    • https://cdn.sqhk.co/wanuvudeb/jfs1Cig/gakivukuwedupolu.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/gjigJjc/trainee_train_driver_jobs_sydney.pdfIn PDF document text
    • http://organicsss.space/158209673036acr3.pdfIn PDF document text
    • http://liko-sneakers.com/32461028239vluxz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5fcc0e820e57e.pdfIn PDF document text
    • https://cdn.sqhk.co/lozosasuxe/doOgigj/82289819252.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/ad584f0c-eb91-43d3-9762-34bc1d65e448/98740969412.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/aws_certified_solutions_developer_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e871ccf-78ed-4fdd-8259-5adcfdd3abfc/jekus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28eb2fe9-c9e3-4389-bcbd-d8ed54c1c446/how_to_pair_soundpeats_to_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/new_ayyappa_telugu_songs_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/97177714653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be5c1cb-3297-461a-8569-c9375e2e0744/ingersoll_rand_air_compressor_t30_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/7274676361.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_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 5712 bytes
SHA-256: dfa6824d07c1559f641dd38f9926d88a563149909b55ed2d9a771a2c7b01ac1c
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 11224 bytes
SHA-256: bf479406150c1a04341c758eef49672cefd3d28cf3d608127e783eb618878b9f