Malicious PDF — malware analysis report

Static analysis result for SHA-256 f279f36516f9538d…

MALICIOUS

PDF

87.6 KB Created: 2021-05-24 00:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcdb9f52aaba5e2aabb7e38c71361488 SHA-1: 983d7fb6377fd90da1db23eebce3167afb74bf47 SHA-256: f279f36516f9538d8e1d42d0eb7c23d8ffe21373b8e4a89ea1ec3742fe9550a8
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://nipisod.ru/strik?utm_term=gta+san+andreas+android+mod+apk+%252B+data+cleo', is presented as a lure for a game download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=gta+san+andreas+android+mod+apk+%252B+data+cleo
    • https://cdn-cms.f-static.net/uploads/4469640/normal_5fe9d2f0eaf1b.pdf
    • https://koligopore.weebly.com/uploads/1/3/4/6/134605833/2557141.pdf
    • https://cdn-cms.f-static.net/uploads/4443325/normal_606a62a65ad96.pdf
    • https://cdn-cms.f-static.net/uploads/4414687/normal_605ab47f7463a.pdf
    • https://static.s123-cdn-static.com/uploads/4498376/normal_5fe22f5e1334f.pdf
    • https://tofaxewa.weebly.com/uploads/1/3/4/6/134672655/jokesiterovupoxeko.pdf
    • https://cdn-cms.f-static.net/uploads/4485434/normal_60177ae52300c.pdf
    • https://static.s123-cdn-static.com/uploads/4493873/normal_600084c39c4e7.pdf
    • https://jexedijelewa.weebly.com/uploads/1/3/4/5/134518212/412177.pdf
    • https://cdn-cms.f-static.net/uploads/4498678/normal_606559f9cdd15.pdf
    • https://tezonebikinigax.weebly.com/uploads/1/3/1/6/131637870/5767320.pdf
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5fe690774039f.pdf
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/350133.pdf
    • https://cdn-cms.f-static.net/uploads/4456114/normal_6010a00226771.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/974eaa11-5a92-4593-8294-f5852c03bdc5/how_to_set_coordinates_on_a_garmin_gps.pdf
    • https://uploads.strikinglycdn.com/files/067c0abc-fd6e-413f-93e0-d6bea6dddfd2/watch_kung_fu_panda_2_full_movie_youtube.pdf
    • https://uploads.strikinglycdn.com/files/957d6fdb-26ba-4b44-aa26-f168fc61da3f/44817796527.pdf
    • https://s3.amazonaws.com/babetafaperaxov/82190195493.pdf
    • https://uploads.strikinglycdn.com/files/81138b1e-a65d-4a05-951b-26267d845ae0/gopro_hero_3_price_philippines_2019.pdf
    • https://uploads.strikinglycdn.com/files/57622e42-f745-4372-ac08-5b5bb0947685/51405993832.pdf
    • https://s3.amazonaws.com/jonora/xitefivejixufimutetevikor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001040a.bin
4aa0a52eb69000a16b396debb80ecb58106cbcb0d7a66abce5e45671d66121f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 5100 bytes
font_01_sfnt_off0001154a.bin
00926aa0a598d57fb53c4aa93da7dd7e8eded8383e0e6f5812a1887056b36593
pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 17540 bytes
font_02_sfnt_off000142fa.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x142FA 4324 bytes