Malicious PDF — malware analysis report

Static analysis result for SHA-256 28658e1f9a14f906…

MALICIOUS

PDF

78.7 KB Created: 2021-03-30 04:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1942c4d8732498073be7de4ed6a6c97e SHA-1: bb0c2dbbf15c1777a3503553d25d312e76982f3e SHA-256: 28658e1f9a14f9066844f0213907aef151ccfa493913851efa622d358780551e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to disposable hosting domains and redirector infrastructure, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious websites for credential harvesting or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://yafferge.ru/aws?utm_term=how+to+use+a+ring+size+chart
    • http://ig-objectionform.com/64965473062s7i2s.pdf
    • https://fijozemubo.weebly.com/uploads/1/3/4/2/134234573/1b4074561c85.pdf
    • http://flowerport.store/vowejolopofchtbo.pdf
    • http://itravelimpressions.com/how_do_i_connect_my_laptop_to_my_verizon_mobile_hotspotb5ox3.pdf
    • http://power-guard.shop/audi_a6_avant_2006_manualko9h6.pdf
    • http://verifedform.com/american_assassin_cast_2017fda0b.pdf
    • http://nanolenka.xyz/1445026790182kdf.pdf
    • https://midubumiw.weebly.com/uploads/1/3/5/9/135989619/33e08d2474e167c.pdf
    • https://pigokujedaxe.weebly.com/uploads/1/3/0/7/130740563/81542f2da.pdf
    • https://natorepoxikafop.weebly.com/uploads/1/3/4/3/134314237/tugevasolatoxob.pdf
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/21f79953c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_3e95d312e4e944a488e244fbe386d7cc.pdf?index=true
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_5bb5155219484e03a321d5c2050721e3.pdf?index=true
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_ebd2728af14247258c4e62e933bcb7dc.pdf?index=true
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_9d44841f0c154723aa0740a6e2e6991a.pdf?index=true
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_dd48567e4f844d19ade173d8735fd935.pdf?index=true
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_6f15309f552a4ffc8709138530591103.pdf?index=true
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_9b0a9a7d4ac24823ab937def31f87c4e.pdf?index=true
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_c0bcb537c02a4548aebd643fbe2cfb07.pdf?index=true
    • 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_off0000f7b4.bin
2c8307dabdda85c007fee92b0f8d073278ab65420cc5d1ddcf411fa664977183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 5132 bytes
font_01_sfnt_off0001093c.bin
2cd4fa01109860537139d680b2430cd439ce7df5515c5db414a70eb99c60e688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 10632 bytes

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