Malicious PDF — malware analysis report

Static analysis result for SHA-256 598a5b9e5d6d7440…

MALICIOUS

PDF

78.9 KB Created: 2020-12-17 05:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c89765c5a84d7608034b7550f4fe03b6 SHA-1: b671cc248220c2368f4e20c14f23b98577f1a960 SHA-256: 598a5b9e5d6d74407527f74bb1f589c64d6f21147ed0a792805a5fb215077aa1
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to other PDF documents hosted on various platforms. One of the primary links directs to a known malicious redirector, indicating a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=commercial+real+estate+analysis+and+investments+david+m.+geltner+pdf In PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/zuwoxu.pdfIn PDF document text
    • https://pulipelese.weebly.com/uploads/1/3/4/6/134686308/2883946.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/7e9eafa4d81e.pdfIn PDF document text
    • https://kapebuzuzevasa.weebly.com/uploads/1/3/4/5/134587117/rimiz.pdfIn PDF document text
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/3255599.pdfIn PDF document text
    • https://likuxosudiva.weebly.com/uploads/1/3/4/6/134603152/3cbb7c7e4.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/3ebb9b.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
    • https://uploads.strikinglycdn.com/files/2db5dd63-9511-470e-a595-b7dad57142a2/act_1_the_crucible_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/xuvovugulavefatom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17776444-7682-4797-8c5a-efb9b3937f85/1010100261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9396e14-9a00-48c3-9a6a-b32beb0c67e8/misawunuvebixelukazol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14fc9487-8da8-4465-ac42-f113a1e4f144/top_thailand_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/95679522971.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68766ea4a794d566c19da/t/5fca29932ae1264a039aef21/1607084442581/zaferizegiloxadufetivo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56d376b97992eb57a16b7/t/5fc73be8c953717e09d52158/1606892520575/second_hand_clothes_sydney_online.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_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 5480 bytes
SHA-256: 887e55422d391dd14e91786eeebe4418bb53dc30ddba15544ddda2b441ebc5f0
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 11560 bytes
SHA-256: c688b150c1bd57b472817f7263c03abe16f869d30a8ee02283e1c96eef32f7e6
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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