Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c5e6e2c50f5b6f…

MALICIOUS

PDF

78.6 KB Created: 2021-03-09 06:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4785998e537cf97c7d8c3451cd4bf45d SHA-1: 81f67a54c747a2631bca7f19df9a5b8b11cfc20b SHA-256: 57c5e6e2c50f5b6ff42a795d6c8cfeae912542319ea98776e1c1cb86bf0566b2
204 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and is flagged by multiple heuristics as malicious, including a critical ClamAV detection. The document body, though garbled, suggests a lure related to 'food stamps', indicating a phishing or scam attempt. The presence of embedded URLs and the overall structure point towards a phishing attack designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yafferge.ru/strik?utm_term=how+to+apply+for+food+stamps+in+el+paso+tx In PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_602edaa90725d.pdfIn PDF document text
    • http://rmk4sale.xyz/10576412710ag8z.pdfIn PDF document text
    • http://limaxinsto.xyz/6970190060xm9y7.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/igejh9I/delicious_recipes_with_chicken_mince.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_603e9f554b2bd.pdfIn PDF document text
    • http://mkr-olimp.info/delaware_certificate_of_incorporation_long_formv98c9.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/HLgh8gj/pressure_washer_lowes_prices.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5fdb73a909664.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/fgemghc/pixel_gun_3d_world_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472764/normal_5fdd20ac62e16.pdfIn PDF document text
    • http://portkamesto.site/34175303815kvrp.pdfIn PDF document text
    • http://4kuhd.me/nobalugogopirufizokozoojeqk.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/ibIGtjh/zezuwegumuperozepulasenow.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/opt3he3/biografia_de_simon_bolivar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a2230d-5b44-4a16-8da0-6050aafb52f9/zudot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159efabf-2442-485f-8c3d-e06856bcc41b/56175078263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0483b0-a141-4ab1-80d8-06e4eb639fcf/52646826887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c611304-bc8a-4cd7-8c80-6281f4db6738/18349103840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bae02a6-055c-4289-a319-4310ebfa9be2/maytag_bravos_dryer_error_code_f51.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f88a76f-b1c2-465f-880a-e8a8e8baa30f/rinufojevefosapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb18432-eeaa-4fba-814c-aa25053a23e4/gaggia_brera_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095111bb-a180-4d99-911f-3e20cb3fc38d/how_many_calories_does_a_pollo_loco_salad_have.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 5408 bytes
SHA-256: 60b4e4c849f8e358861d15d56dbd6953c718f1d925298293341a7e9a0b2732bc
font_01_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 11436 bytes
SHA-256: 0ec886d93e01a8b1dca15f7f55a6664f9cf7d1fd4534473160725917e3ebd91c