Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c823f2578633c03…

MALICIOUS

PDF

68.3 KB Created: 2020-12-24 20:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a5e5838cd9ff4993192189011a3849b3 SHA-1: 18b8da852ffaae1b9ef6d481bdeeb332b24ec0ba SHA-256: 3c823f2578633c03950f27c7efd3bcd262f5fffc586ec95604f38bb111304600
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded URL `https://ggtraff.ru/strik?utm_term=fuel+tanks+iowa` is identified as a known malicious redirector. The PDF structure and embedded links suggest an attempt to direct users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?utm_term=fuel+tanks+iowa In PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/lapaz.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/5379820.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/5331ec1e-768d-4b66-a666-c9ff5642c71c/18943524904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89904ab2-908a-4814-b9fd-1adffec16ae8/yoga_asanas_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af17d9d2-add2-4bfc-a120-8fe0e728becd/amc_marina_pacifica_12_avengers_endgame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e62794c-0caa-4aa4-8f04-60d159afc7ff/lalitha_sahasranamam_meaning_in_telugu_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d8b736-b682-47c0-95a7-807a567aa6e5/97349461437.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/capitulo_4a_realidades_1_answers_que_hacen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd8e4e1-d72e-4c70-9d7a-5411150e33d4/ib_chemistry_study_and_revision_guid.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/70333182075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b9754b-69b8-4d4a-bb4b-c523b162890b/taxi_driver_sex_scene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d990a075-c774-42ee-b075-bed2f53ede1d/rupavukutozusun.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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 4692 bytes
SHA-256: f493cbf4273442ce71e88fe5256aa5653c8db1983210a66a22a41b48f0f3b551
font_01_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 9748 bytes
SHA-256: b1f233dc2acc9a0f0466403640b525b17dfb86b8632a3613dd689082cda24cfe

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