Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4e1c4114eee407…

MALICIOUS

PDF

108.8 KB Created: 2021-03-04 18:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 403916469b3ac561cbb27cd4b9715542 SHA-1: b041453fa8b0cd3131e48b212e7e66cfae4399c7 SHA-256: 2e4e1c4114eee4070057c0a1b63128860489c6dceef3c13509ebfff44ddf10e7
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, one of which is `https://soxebez.ru/wix?keyword=kim+doyoung+yg`. This pattern suggests the document is designed to drive traffic to potentially malicious sites, possibly for phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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-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://soxebez.ru/wix?keyword=kim+doyoung+yg
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/fefudareveloti-fomeb-mamikuvipowe.pdf
    • http://winsbig.space/baahubali_picture_2p76yh.pdf
    • https://static.s123-cdn-static.com/uploads/4366354/normal_6005067aa8364.pdf
    • http://mirror-x.org/divorce_in_the_old_testamentnszph.pdf
    • https://cdn-cms.f-static.net/uploads/4365661/normal_6033210727c86.pdf
    • http://bimoriz.getenjoyment.net/scag_cheetah_mowers_reviews.pdf
    • https://cdn-cms.f-static.net/uploads/4501233/normal_60220966dc7e1.pdf
    • https://mafatuxaxi.weebly.com/uploads/1/3/1/3/131384293/a18bcb92c12.pdf
    • https://givigifug.weebly.com/uploads/1/3/4/8/134858651/boses.pdf
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/pimesofazeveg.pdf
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/3999638.pdf
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5fe0296333610.pdf
    • http://xatovapotogu.mywebcommunity.org/zexapo.pdf
    • https://tubidurifubadas.weebly.com/uploads/1/3/4/8/134885002/856e7b.pdf
    • https://tomudonaki.weebly.com/uploads/1/3/4/7/134715401/xarug_bovapulog.pdf
    • https://kigukudisan.weebly.com/uploads/1/3/5/3/135321724/mizusigo_mewajulifu.pdf
    • https://titapogesasoja.weebly.com/uploads/1/3/1/3/131380181/teruditagakad-fefuzomotafi-likutanugi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_e6151ca7aa224c27868cbf8f40a5b3cc.pdf?index=true
    • http://wesatume.atwebpages.com/74426714641.pdf
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_5ecc4179484146b288fb5f2fb8786055.pdf?index=true
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_d30a8adfd9d44d0d85c86417d927fbef.pdf?index=true
    • http://sidepojedava.myartsonline.com/50245805783.pdf
    • http://zudupaxub.myartsonline.com/taxapinudosuf.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c6f.bin
d547aade6c9fbb27fcef1624a0ebbd6fa2b11591ce441e3988b1c54520f930c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 15772 bytes
font_01_sfnt_off00014f0c.bin
4eca95803fb2fd80fefd28f1f9b8680cf597b8b0e3e9f3ea80f02deafe76ac79
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0C 4700 bytes
font_02_sfnt_off00015f05.bin
24f35a0cb86f9346c1c88bcf619489cb9f4a1097af46d7a5b383b69ea76b72b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F05 2016 bytes
font_03_sfnt_off0001686f.bin
a221715b4f731018e8e971be490aefe3b121559dca6c4413c6bbbddc6be263eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1686F 10980 bytes
font_04_sfnt_off00018e34.bin
9d11eb94278ed327486658b117807b80f9f3c295a546a5f7465bea149c530a67
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E34 16468 bytes