Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a533c887115104…

MALICIOUS

PDF

77.7 KB Created: 2021-03-28 14:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 473c7fe5a759eb3e98fe26f02efef77c SHA-1: ad8123087cd36a221e5af2b2465690c74097b667 SHA-256: 73a533c887115104a334f216a2271df3671d08cd7821ae04d09c00b1a1415c7a
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector domains. The primary malicious URL identified is dafemum.ru, which is flagged as a known malicious redirector. The file's structure and link farm nature suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=telecharger+la+boite+a+merveille+pdf+complet In PDF document text
    • https://xedagiwaki.weebly.com/uploads/1/3/1/8/131856626/6ea271e.pdfIn PDF document text
    • https://misadedami.weebly.com/uploads/1/3/3/9/133997414/memerakasapafuk_sazeziruj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451950/normal_5ff50c15ee072.pdfIn PDF document text
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/kegajikuvitawolaxos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_60536ee765772.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/e2ea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_6059cf9316e3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5fd8b68295814.pdfIn PDF document text
    • https://bidumijedurazi.weebly.com/uploads/1/3/1/4/131437194/tolugobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_ee13af1592584f2b96c22f3fabcd1834.pdf?index=trueIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_0deac179a8ac48c3894a45419b840e32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/baby_babble_unscramble_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/wugejapalijifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428e6c73-fd44-4499-bb50-3db489ac5243/cybersecurity_for_dummies_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/crystal_report_activex_viewer_control.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_03f2919c13aa460c8e8ee3b7d22249b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/742f4d49-d8df-49e6-be49-e9f413dd062a/22303537830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a91d754-95f9-45a7-8f3b-ac1a41b61ab4/vijofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9fd4b51-79c0-4392-a585-1cfc515af47d/frosty_the_snowman_story_read_online.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_1e72270c25094a578d51c02e09787eac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/46486378837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290186c5-6eb4-42ec-8da9-21587330c5c2/hp_laserjet_m1212nf_mfp_scanner_driver_mac.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_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 5540 bytes
SHA-256: 749f0639846e9d72c951ff469c18afb4be0a0aefd88d27194eac70d5a8168ff4
font_01_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 13064 bytes
SHA-256: 2c27ee731a1cf118a8532b67d5ff557994dc2b307df7eca2b0d0fa4a9e155add

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