Malicious PDF — malware analysis report

Static analysis result for SHA-256 b718eab9482534bd…

MALICIOUS

PDF

68.3 KB Created: 2021-01-10 18:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 827d3f5bdae6391bcc3278d06a92a381 SHA-1: 9306d0885a9d88d10336dd94ec3a1a713c619afa SHA-256: b718eab9482534bd41011089031e0a5600af765614d7f953593dbfd01acd2296
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for MP3 downloads. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, some of which are confirmed benign but others are unknown. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=miguel+how+many+drinks+mp3+download In PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/fetadiwewud_kozas_tirono_vozetawajetilo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445889/normal_5fca097f56a28.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/gebizuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fde4230aa2ae.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/xalasawu/one_grain_of_rice_can_tip_the_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/jurnal_penelitian_akuntansi_manajemen.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/cecil_county_dragway_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/ramafuned.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/mixokejitinasupibeduzu.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/furinofapabeve.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/mekovema.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/best_app_for_windows_10_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/96405364208.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/betpawa._com_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/3052176283.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/camouflage_uniform_in_ww2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD70 5800 bytes
SHA-256: 93da74f533151a16dd4ad52e51554abecb380f9319a23a416bf437e4d4d14bd7
font_01_sfnt_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 3036 bytes
SHA-256: f426c25ccbca7b9a3821bfb45d971a810ca10631cc5b06d8beb32cab31bd3d49
font_02_sfnt_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 11580 bytes
SHA-256: de521982946fe9a73179baf34c701434fc056dd4beba0c0cb60d26938f83dfc5

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