Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcecf64fc47997a…

MALICIOUS

PDF

78.7 KB Created: 2021-06-11 01:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d856aaebd777b8fdb608b3d666e0f53c SHA-1: 467e48c62d94480b8a895ca75d6da2884149641c SHA-256: ddcecf64fc47997ab7a9abcd2c32e07b8b17d60b0ad9f06776fc15ef3d9c5521
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious websites. One prominent URL, 'https://pistant.ru/pbw?utm_term=brawl+stars+unlimited+money+apk', indicates a lure related to game cheats, likely leading to a phishing or scam page.

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
  • 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://pistant.ru/pbw?utm_term=brawl+stars+unlimited+money+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386092/normal_6061694e4972d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_604cbd0b9ebc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459482/normal_6055ed62cf137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501479/normal_60525ba847afc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_60152092c4950.pdfIn PDF document text
    • https://mixutexevegov.weebly.com/uploads/1/3/4/7/134706804/5779423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_5fd3516025f44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fe9aadfd1439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_6001d99527ec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_601da80583a42.pdfIn PDF document text
    • https://guxodobozit.weebly.com/uploads/1/3/4/3/134333536/mamapanom.pdfIn PDF document text
    • https://kuratiwupojaxu.weebly.com/uploads/1/3/4/0/134017491/dawukifaxobar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_600a573db9f12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380213/normal_5fc57592f04a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_5fda3bed3f648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/cuantos_milimetros_son_3_8.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/how_to_look_up_serial_number_on_dell_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c659bd-32c6-4c90-9d9e-70482b80538f/pidomafu.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/w/file/fetch/144508809/19936284231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0884c91-5d5b-448e-907e-e8783e6111c4/how_to_draw_anime_eyes_female_cute.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 3048 bytes
SHA-256: 0c5b4e9652f485aa44e2b75148e67188a9acca2dd3be28e5c76ba9de96846ead
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 5412 bytes
SHA-256: 66ffc3e25b1dde62c16bf78f18eaa7ef20c37512f581047654918281c6829680
font_02_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 2268 bytes
SHA-256: ad6b7d89c5fa709855afe00301495b63a95e2ac7f715e2abd2fcaf396ca2e5f3
font_03_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 10980 bytes
SHA-256: 56b629faf0c66d8d67c39373c85fbba125099a55456609aa6f45392df4d300ce