Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c15fd4a279015bd…

MALICIOUS

PDF

76.1 KB Created: 2021-03-16 22:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ad67e2ab8823f837feb31971151686 SHA-1: d211936914ef4e80879e252c072895e8619f500b SHA-256: 7c15fd4a279015bd881d999c616534543988c7bce2808639a2dba5892666453b
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, with some pointing to suspicious domains and one specifically noted as an invisible link lure. The document's structure suggests it's designed to host a large number of links, likely to manipulate search engine results or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jumiwimov.ru/wix?keyword=github+projects+on+resume
    • http://vsspb.ru/are_valkyries_from_asgardbwjmj.pdf
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/b4d9de88a61.pdf
    • https://senemoribut.weebly.com/uploads/1/3/4/7/134703027/3d15c63d.pdf
    • https://zavifojixu.weebly.com/uploads/1/3/3/9/133997579/paxid.pdf
    • https://boderaraza.weebly.com/uploads/1/3/1/4/131454415/1923513.pdf
    • http://idealslimitalia-oficial.site/51260000635ascea.pdf
    • http://discout.online/42306618514j2rp8.pdf
    • http://winatesef.sportsontheweb.net/maxi_cosi_pria_70_car_seat.pdf
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/dijuxor.pdf
    • http://tefuvawilutir.mypressonline.com/worejetawojafita.pdf
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/boneli-tedonenu-toxegewanegizuz-lesabumapep.pdf
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/87e47c24.pdf
    • http://tepifugamokeg.medianewsonline.com/robufedevofaxefapugas.pdf
    • http://ita-bio.fun/hp_laserjet_pro_400_toner_price_in_pakistan22vbp.pdf
    • http://loginwithfb.site/vadexopuwlzf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b0b30c7a-c9e6-4249-9f13-47e673be3620/rosemount_3144p_datasheet.pdf
    • https://uploads.strikinglycdn.com/files/9a7a2ce7-3e1f-4e5c-b706-335010062480/96078641530.pdf
    • https://uploads.strikinglycdn.com/files/ee8624e2-4538-4da4-a0b5-5d455be155ad/what_are_some_emotional_regulation_skills.pdf
    • http://vexolofifete.atwebpages.com/olivetti_lettera_22_vs_32.pdf
    • https://uploads.strikinglycdn.com/files/77f12b97-d0e6-411e-85ee-fa7c9ddfd6df/what_is_the_best_32_smart_tv.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_off0000ecfb.bin
99453ca0d69e56750cd9211cfc4f7b27392519c22a117d6ad34e78fbec008e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 5180 bytes
font_01_sfnt_off0000fe75.bin
dd10612b8b628e8f50fd18c12d1420783b2dadb850cbe1969c0b8f591372319e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10364 bytes

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