Malicious PDF — malware analysis report

Static analysis result for SHA-256 de442519cd817ef0…

MALICIOUS

PDF

78.3 KB Created: 2021-03-06 04:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0867443890ffece32b52aa50e5d110b SHA-1: bd18c7adc3d63af2678e11e4846a289dea6a3db9 SHA-256: de442519cd817ef03672feb61c7165810f4ef1aab3e438cb82f76bbb89480a1c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a video game guide, likely to entice clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/aws?utm_term=dark+souls+2+scholar+of+the+first+sin+guide+pdf
    • https://latoratepowubum.weebly.com/uploads/1/3/4/7/134713938/47b76281dc79ad1.pdf
    • https://bisenazogogo.weebly.com/uploads/1/3/4/6/134686343/db6222.pdf
    • http://myimperfectmomlife.com/21692627978mknd.pdf
    • http://kovuzaxaf.medianewsonline.com/wazaluzaviputajo.pdf
    • https://finirawex.weebly.com/uploads/1/3/2/7/132741073/4240453.pdf
    • http://submonster.xyz/astm_a36_material_propertiesfgqnm.pdf
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/mifugif.pdf
    • https://sizonijuza.weebly.com/uploads/1/3/4/5/134594560/f8a3cfa.pdf
    • http://tometifo.getenjoyment.net/arduino_starter_kit_manuale_italiano.pdf
    • https://jefamiwufilidiv.weebly.com/uploads/1/3/1/4/131409158/nivojimujijilasen.pdf
    • https://sibozigoguxo.weebly.com/uploads/1/3/0/9/130969143/735c8348.pdf
    • http://francobusiness.com/24668918138z5vpe.pdf
    • http://limons.space/56638609922mmdkh.pdf
    • https://mizojomi.weebly.com/uploads/1/3/0/9/130969452/senesubu_wuriluko.pdf
    • http://odemebayisitrafik.com/negifefefekixoromovjoxid.pdf
    • https://dubuvolikumo.weebly.com/uploads/1/3/4/0/134012832/dozimope.pdf
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/besurisavij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f1811fc9-f46c-42d0-836a-f4cb62379a32/2452041594.pdf
    • https://uploads.strikinglycdn.com/files/22056e4b-b3fc-4133-b4ab-b5f9cd187def/platos_republic_book_8.pdf
    • http://wuvuwipiwizovid.epizy.com/arcore_apk_1._2.pdf
    • http://kudopotawo.epizy.com/tawipobudutaj.pdf
    • https://uploads.strikinglycdn.com/files/0169bc3e-e6c1-4146-9375-dcb298d526f2/vixemozobadogixisorore.pdf
    • http://jutesokom.rf.gd/62008721742.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_off0000f1c3.bin
17de52b9d0d956e83ed1aba7bd15c6ba783fa42e028cdc65ce64be2021e053f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 5612 bytes
font_01_sfnt_off000104e4.bin
2d0960ed55d7f01ccf780e81c8bbedcf071cfd6e6275fd496a149c4109d64645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 11692 bytes

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