Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd4df67b28d9c0e…

MALICIOUS

PDF

76.6 KB Created: 2021-05-29 12:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6b5ef36bb1aafee1375117d5a495fd6f SHA-1: 053f49122be9e9c6c293ca307361cfc1948d8c5c SHA-256: 1fd4df67b28d9c0e16e57fb970bee3ca0ed984513a6af2cdc11df61db772168d
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML model, indicating a phishing or trojan distribution attempt. It contains a link farm with numerous external URLs, many hosted on disposable domains, designed to redirect users. The document body, though partially corrupted, suggests a lure related to financial matters, specifically closing a bank fixed deposit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://bologen.ru/strik?utm_term=how+to+write+a+letter+to+bank+to+close+fixed+deposit PDF link annotation
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/wixevip.pdfIn PDF document text
    • https://wabegikabakupoz.weebly.com/uploads/1/3/4/6/134668284/remejumolor_mevikugiba_simowazirigimel_jegukewoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452865/normal_6019fef23cb03.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/tuzedadejuxu.pdfIn PDF document text
    • https://womepibenim.weebly.com/uploads/1/3/4/0/134040947/1487479.pdfIn PDF document text
    • https://gamalisixidu.weebly.com/uploads/1/3/5/9/135958628/b9dd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_60504d5dae621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fd632dbbe835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5fe5b538c27cc.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/f8fc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_604cbe9edd4f9.pdfIn PDF document text
    • https://voderixata.weebly.com/uploads/1/3/4/2/134266977/resewujox.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/xuxomin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_6065c40f2441a.pdfIn PDF document text
    • https://wededizopi.weebly.com/uploads/1/3/3/9/133986349/nisodonelefipikam.pdfIn PDF document text
    • https://suziviwibemenaf.weebly.com/uploads/1/3/4/4/134485417/tozovufanavoxuxa.pdfIn PDF document text
    • https://wavarojejepifog.weebly.com/uploads/1/3/4/5/134590929/fudim.pdfIn PDF document text
    • https://sofowalomutupal.weebly.com/uploads/1/3/4/3/134310420/gupajawuluzelilab.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/2a02d026-4176-409a-a9fc-aa139f3f12c5/53379715927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45897ac-f46a-44dd-a93b-eb962d7a90cf/because_i_could_not_stop_for_death_summary_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61cc0dc-ba2d-4032-ae4d-54477c5d69fa/xijubavadiramedejezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6dcf22e-8eda-4fd4-aa6f-294df464e0e7/jumabuxojakok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5f56e8-7176-4b84-9c1a-d2e94a5a7b8f/dell_precision_t1700_i5_specs.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_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 5476 bytes
SHA-256: 946b7c23805b12127a3a2b445be76dc8bc64fbd378191e6699e7c76ed6cace31
font_01_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 10560 bytes
SHA-256: f0a6efbea131ed19d04042118ed4922602d824fba8338727984cf219b5eb716a