Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bafbb57fe43d20…

MALICIOUS

PDF

76.2 KB Created: 2021-03-24 00:06:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d11add6bf6dcfabfaf5fa61c133bb06 SHA-1: d08e8c07680ffcb06e76aea2697acb8641ac7b46 SHA-256: 24bafbb57fe43d2055aae6c7c71d76804d80bf6d7a7d9a1ef16d18abf3e79654
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=ata+guidelines+thyroid+in+pregnancy
    • http://sivelural.mygamesonline.org/42517983021.pdf
    • http://update-win20.online/23336411943wjsec.pdf
    • http://milanomoda-italy.website/how_to_reset_holmes_space_heateryigu3.pdf
    • http://guzuguse.22web.org/58582890662.pdf
    • http://ses-paypal.com/gaggia_classic_espresso_machine_accessoriesvpo2g.pdf
    • http://mudubafap.iblogger.org/toro_gts_6.5_personal_pace_parts.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rumukejilaji.epizy.com/online_browsing_platform.pdf
    • https://s3.amazonaws.com/wiremeresegikon/optimal_balance_sheet_structure.pdf
    • http://jopugobov.rf.gd/dozekupewodasavagewa.pdf
    • http://kubatejabudebuj.rf.gd/houston_rockets_media_guide_2018-_19.pdf
    • http://rukosivujuxu.atwebpages.com/azure_az_103.pdf
    • http://domumulavonevef.rf.gd/get_baby_groot_fortnite.pdf
    • https://uploads.strikinglycdn.com/files/930e1d40-d286-4768-96ea-3d61d4344cfd/sears_humidifier_filter_14909.pdf
    • http://kabuzore.atwebpages.com/27976242926.pdf
    • http://dokovavoxibasu.rf.gd/ulceras_aftosas.pdf
    • http://vitufofotozam.epizy.com/70961932086.pdf
    • https://s3.amazonaws.com/limepusotanal/what_happens_in_the_end_of_blood_of_olympus.pdf
    • https://s3.amazonaws.com/popisiburewixuj/koxuzul.pdf
    • https://s3.amazonaws.com/wemofodi/44636166687.pdf
    • https://uploads.strikinglycdn.com/files/3e7876e8-dece-4275-8819-876c15c43a22/how_to_put_baby_in_ergo_360_on_back.pdf
    • https://s3.amazonaws.com/jaxesabi/jenazizoxevenup.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb56.bin
5ee8eb300f185f227126408ab26d2801ca88d56c75df99b125241a250a03e9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 5428 bytes
font_01_sfnt_off0000fdcd.bin
16caf24187d075a3d1490ac025f6c947470711d231db667f2e01b07ea32c640e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 11272 bytes

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