Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a8d2f1d6d738be…

MALICIOUS

PDF

83.1 KB Created: 2021-03-05 03:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 274c3ca2519e2f5aaaf5dac598f9879d SHA-1: e3e0c74bc9c3694dab4864c70aa19dfa93b1f4f2 SHA-256: 28a8d2f1d6d738be92683df9363321211f06643462d9ebd424fd83e3f0b3cb35
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The document body, though heavily obfuscated, appears to be a lure related to software updates. The presence of numerous external links suggests an attempt to direct the user to malicious websites for phishing or malware delivery, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=how+do+i+force+update+my+tivo+software In PDF document text
    • https://lolifibek.weebly.com/uploads/1/3/4/6/134634661/bukukejo.pdfIn PDF document text
    • http://mebets.xyz/higher_engineering_mathematics_by_hk_dass9pqtp.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/bafekotizejij-nuzadonebudu-tekegi-tiziba.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/3608069.pdfIn PDF document text
    • http://on-arenas.com/rheem_power_vent_water_heater_repair76gcc.pdfIn PDF document text
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/kopepikosadisipofobi.pdfIn PDF document text
    • http://mklhhhh.space/baldurs_gate_dark_alliance_gba_manual5wres.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/2282927.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/8230101.pdfIn PDF document text
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/ddd139c5d00e4.pdfIn PDF document text
    • https://zejawilopasu.weebly.com/uploads/1/3/4/6/134684926/4617255.pdfIn PDF document text
    • http://logvoz.ru/dynamix_treadmill_kp329_user_manual5si5x.pdfIn PDF document text
    • http://ritual-venki.online/lemipepitizebef1ecx.pdfIn PDF document text
    • https://wemizufatevovig.weebly.com/uploads/1/3/4/8/134896488/6f87fbf035d6b96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sonituzesubilit.epizy.com/nosovixigofurununuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ecdb14-892f-4d69-a1df-7555f71adcff/john_deere_42_snow_blower_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44bfeca-89d1-4c11-9dfa-ad22aa871c5a/how_to_order_checks_online_bbt.pdfIn PDF document text
    • http://maligufaribez.epizy.com/karcher_pressure_washer_spare_parts_hose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eae18d4-3d2a-44c5-aded-dc9360a66635/will_james_allen_negotiate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d851918-278f-4cf3-bf35-933c6841fb0f/73152851973.pdfIn PDF document text
    • http://farevuzafi.rf.gd/22957293613.pdfIn PDF document text
    • http://zasasopatadinu.epizy.com/pirigag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645e0552-659e-4909-8297-45d7181bcb35/lozolagiri.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_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 5260 bytes
SHA-256: 53bdde29e8a3c8fe144e17530b37ce1c1876a810e27fc40b6e43cbe9cd821347
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 11292 bytes
SHA-256: c9dc948f66308c506594cca27c25175da50f53d87e45f4f1fda64c06c93aed08
font_02_sfnt_off00013076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13076 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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