Malicious PDF — malware analysis report

Static analysis result for SHA-256 1265515cf6260313…

MALICIOUS

PDF

85.5 KB Created: 2021-03-16 06:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1ee4de484182f7515cce61c54768b46d SHA-1: d1546f9ce4ac6bee5c5fe09d10f20d125badb8d3 SHA-256: 1265515cf62603138f520f8a4efed196ffe867ee55e184a90e2c833549d91209
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful content.

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 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.
  • 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://jacksth.ru/strik?utm_term=plant+high+school+hours PDF link annotation
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/wuxegugewe.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/business_english_german_vocabulary.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/puxezanaxugekadutixu.pdfIn PDF document text
    • http://msertis.xyz/lurusuwapedewapam4lqyb.pdfIn PDF document text
    • http://swiss-gear.shop/vutow5k0ph.pdfIn PDF document text
    • http://axecheat9.xyz/kujenef8yx9x.pdfIn PDF document text
    • https://vaxudiku.weebly.com/uploads/1/3/4/7/134709892/vijanefe.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/netgear_n600_wireless_dual_band_gigabit_router_review.pdfIn PDF document text
    • http://snatural.space/66602442871d41c9.pdfIn PDF document text
    • http://straponartist.com/37204174138ri5q2.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/95136e3c-908f-4bf7-9ba3-db458a937703/panasonic_kx_tgc210pdb_opinie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7cb9ce-9ba7-44e3-8a35-3c3fb1680208/6653638222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2d23bb-a626-4d12-8de2-8b9642131f65/73845225389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41535963-6989-4390-a8cd-945a9ccbe787/best_hero_mechs_mwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37035d21-d91f-4bdc-8737-2f4bf4809bc9/lawem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1c719a-02d8-421a-8526-72715975aed9/11523960330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3a55d2-5127-455a-94b1-ccd04d0322d8/c_d_dog_food_coupon.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_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 4824 bytes
SHA-256: 6e1074edfef135f1f46a4ab4dd29c7261594c84ec06186286e7da42066e143e7
font_01_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 11028 bytes
SHA-256: 8725e597f0794433c9ff32e2d9e7295ae996c137f5a16627bda4126813ed4a72
font_02_sfnt_off00013ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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