PDF malware analysis — malicious · dc0aef18e7c39e16

MALICIOUS

PDF

86.7 KB Created: 2021-05-24 20:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22

MD5: 4f20bbc62d44e90f54d35ced979e2f23 SHA-1: 2ae89e73f562b895519edbc7d350f5287c00f36d SHA-256: dc0aef18e7c39e167f74286f0af1a5294e87c95c3004277e9cb5f5da0881a7be

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The primary URL, 'https://midufefew.ru/strik?utm_term=pokemon+fire+red+randomizer+nuzlocke+rom+download', is presented as a download for a game ROM, a common lure for phishing or malware. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://midufefew.ru/strik?utm_term=pokemon+fire+red+randomizer+nuzlocke+rom+download PDF link annotation
- https://static.s123-cdn-static.com/uploads/4481173/normal_5fc79a389e264.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387709/normal_603a94664cca4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417046/normal_5fe623127f57c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427498/normal_6041b6e5769da.pdfIn PDF document text
- https://wapubepedud.weebly.com/uploads/1/3/1/4/131455956/1524059.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4453098/normal_600c79cba078d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445325/normal_5fd809a02447c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413474/normal_60206da411de3.pdfIn PDF document text
- https://muzufuwuvul.weebly.com/uploads/1/3/2/3/132302955/toderuviwo.pdfIn PDF document text
- https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/wavemuvalibatu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408858/normal_600e975184f29.pdfIn PDF document text
- https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/genore.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403540/normal_602faf0fac1f4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4468274/normal_605fdfa6537af.pdfIn PDF document text
- https://vedifejoroda.weebly.com/uploads/1/3/4/5/134521361/9a54eb944.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417534/normal_605a102f4bcc5.pdfIn PDF document text
- https://kenazago.weebly.com/uploads/1/3/1/0/131070597/sojozusivazaduruw.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391602/normal_604f0d0d66529.pdfIn PDF document text
- https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/5381602.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/c2ba9068-9561-40d1-b6b1-c6ad2f5bc6d3/bluebeam_revu_cost_per_year.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/82b22f6e-9fb2-4994-a936-d32648b904b7/35889315190.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0d382265-324b-4900-8302-4de23f6b0f81/77715796274.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/929a919f-96f6-49dc-bd89-75720865b77b/lenovo_t430_laptop.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0620b8c7-7d1f-44ae-a46a-b7a1c28e86d7/revuketikakulibot.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f29e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF29E	5000 bytes
SHA-256: `d2f8f1befe0a31a2a230445cae44aee6d944f9d63b0e641628f5070259bf9d4c`
`font_01_sfnt_off00010393.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10393	11152 bytes
SHA-256: `77e9c71a9cc6bed7fe3edfb50e9d4d24ec9a1947d6bd738cd90a37df396e98f7`
`font_02_sfnt_off000129b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129B4	16064 bytes
SHA-256: `026a586128736d29da6542416095f0b483470add235992e736c82304e06d1e5b`
`font_03_sfnt_off00013e43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E43	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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