Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e1e1ec89c8e67a…

MALICIOUS

PDF

79.5 KB Created: 2021-01-23 00:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 58d0343003f88c0479ba03c4d9d0c140 SHA-1: 738e56c7c1042280373fedb87baeba5a64aaad4b SHA-256: 31e1e1ec89c8e67a8a5212aa9fdacf4de9c643cce18305fd070244e0df2f2483
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a lure for a movie download. The heuristic firings indicate this PDF is part of a link farm on disposable hosting, and a machine learning classifier and ClamAV both flagged it as malicious, likely a phishing or trojan. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/aws?utm_term=above+suspicion+full+movie PDF link annotation
    • https://site-1174227.mozfiles.com/files/1174227/leveling_zone_guide_wow_classic_horde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414358/normal_5fc5b9087985d.pdfIn PDF document text
    • https://site-1171753.mozfiles.com/files/1171753/g_stomper_producer_apk_free_download.pdfIn PDF document text
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/934006.pdfIn PDF document text
    • https://cdn.sqhk.co/wekonexiw/ehfTkij/multiple_photo_blender_double_exposure_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_5fdac54e937bb.pdfIn PDF document text
    • https://zapikomamotal.weebly.com/uploads/1/3/1/6/131606370/getosivogovo_duxesajo_kuvop_gosimurake.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/1hbJjbn/80th_birthday_decoration_ideas_for_mom.pdfIn PDF document text
    • https://cdn.sqhk.co/refuvowur/ageDPia/gokanakoxajiketotigatavi.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/ghjdgiT/gif_live_wallpaper_download.pdfIn PDF document text
    • https://site-1178588.mozfiles.com/files/1178588/modi_funny_video_download_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/KhbOgdv/just_between_us_austin_texas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/mathmagic_land_word_search_answers.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_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 5044 bytes
SHA-256: b20e3ce277c40234818e0e943a30d9201df5e0f54d6daaa13b87f4a31aaa2c7f
font_01_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 11300 bytes
SHA-256: 014121e97e3534b4715eaba79a2034902a7936f58a2bb8ca87eea2a4803f78bc

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