Malicious PDF — malware analysis report

Static analysis result for SHA-256 024481ec9ba36fe1…

MALICIOUS

PDF

80.4 KB Created: 2021-03-23 13:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f15d0d0346cd74d74e9ea4ffd5bfe894 SHA-1: 3f964b280c0f8adfce06dc08e75253b53a7b01c8 SHA-256: 024481ec9ba36fe1eb6f560aa19725eb521b44a106fdeca911ed3bfe5092c971
186 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with many links pointing to disposable hosting and using UTM parameters, indicating a phishing or spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/123?utm_term=pes+2020+gameplay+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388412/normal_60489de7120c3.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/8344982.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/6338039.pdfIn PDF document text
    • https://kivasemav.weebly.com/uploads/1/3/2/6/132680863/jexasisexasi.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/f4481a4e6.pdfIn PDF document text
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/raviz.pdfIn PDF document text
    • http://nubolats.xyz/english_grammar_correction_applicationsycr7.pdfIn PDF document text
    • http://natgood.space/fobegatubegopuvemefipn5wfq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_600e703caaa3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389568/normal_5ff4d609958b6.pdfIn PDF document text
    • http://kelnoteres.xyz/face_mask_diy_easyx5pba.pdfIn PDF document text
    • http://mihetos.xyz/nefasevuronuwonexaxifirgbvy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_6030a12c2d0c6.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/226b40ab-b4d3-4dde-9be5-0bbe4bc56db0/best_hands_free_car_kit_south_africa.pdfIn PDF document text
    • https://334e481f-4595-4613-8514-cf1b68b0f675.filesusr.com/ugd/a5bb32_1e42440da06147e295cab055fcaf66d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/934d5890-d29c-4253-8346-c7628cf9f047/72497782318.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/rom_emulator_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/ferulujem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e704087a-0ee6-4daf-9843-56e966c944c9/setozuzunivavujom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e39c42e-2e3f-47e6-8e5b-a03f5af79b28/how_to_make_wine_from_grapes_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/75528192002.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/romberg_balance_test.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_e446ea737f4b44fd8985c22d09870bf2.pdf?index=trueIn 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_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 5148 bytes
SHA-256: bc0bc7c0b89f043319dbff35db4faac8e4c1a49d89d5db2b74b54af6f0b870e0
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 10388 bytes
SHA-256: f9265e01cff17608e704ada9a2329ee3ca26e94393be116cc1eb23bec76184a9
font_02_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176