Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a04513e768a117…

MALICIOUS

PDF

90.5 KB Created: 2021-02-27 20:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3787cc30e4c63946b42b9f3fbf598664 SHA-1: bd7ffff547b084b2738df4f848c31610d0b17308 SHA-256: d8a04513e768a11708f88a2735fb193f4a96e9833425af25a8c86a0499f5644e
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary link identified, 'https://crophysi.ru/123?utm_term=samsung+fridge+rfg297hdrs+parts', suggests a lure related to product parts, likely a phishing attempt. The ML classifier and ClamAV heuristics strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crophysi.ru/123?utm_term=samsung+fridge+rfg297hdrs+parts In PDF document text
    • https://lukozosa.weebly.com/uploads/1/3/4/4/134485969/56b72f.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/7Gjhij2/traffic_racer_download_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_600b2a33bf1a2.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/IkD3iby/69346424981.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/fixexuxerozabodul.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/w6gegf4/17835503262.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/jRsQwic/xudosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_60370b3471c38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_5fe5a7228fb3b.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/how_to_make_my_lg_tablet_run_faster.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_6027d130e50b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fd641f3ed8c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_6010037bd7b9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_601e91083a8f4.pdfIn PDF document text
    • https://cdn.sqhk.co/suzironanes/XvH6R1G/51321535688.pdfIn PDF document text
    • http://vifijes.22web.org/26979597820.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/how_to_set_alarm_on_panasonic_cordless_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_601c65082ec45.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/canon_pixma_mg3520_scanner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451941/normal_60007695e11a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisukuvi.atwebpages.com/99981729257.pdfIn PDF document text
    • http://namegudobilud.epizy.com/boral_plasterboard_technical_data_sheet.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 9760 bytes
SHA-256: 7161cfd7bce07260c0b3186aeb9a61c373c9a44201e645c5abb22446aca9f3d1
font_01_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 5896 bytes
SHA-256: 72f44fd62fa76408f6637ca6a8caac7fa9dc90f8c3165da1e13064eab2b570a0
font_02_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 13612 bytes
SHA-256: 9cb525944995570918d4f7a1218105ec780690f61a0450856a3e948dc5c77ce4