Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbe77285eff0fea…

MALICIOUS

PDF

70.6 KB Created: 2021-02-14 16:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c56be786927119385aa5a1f281ca3d2 SHA-1: 18d01bda1a637d3725ece01dcf8aa615eb4cf228 SHA-256: 8fbe77285eff0feac1941b88704258953d698fe7422e47b2b2e2b17dbe046826
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://seumenha.ru/wix?keyword=ppsspp+gold+download+apk+mirror PDF link annotation
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/8498408.pdfIn PDF document text
    • http://tophomework.space/gikuzulisufoxuqkufj.pdfIn PDF document text
    • https://ruweveti.weebly.com/uploads/1/3/1/3/131379789/c5127f4e71c.pdfIn PDF document text
    • https://cdn.sqhk.co/sufipuxifemo/jciiiaX/wavepad_audio_editor_free_apk.pdfIn PDF document text
    • https://nezejigon.weebly.com/uploads/1/3/4/6/134611081/kajifewoniziju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497658/normal_5fe39574a4aa5.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/JiaCicQ/pencil_boxes_bulk.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/b18OJtL/continental_race_king_26_x_2._20.pdfIn PDF document text
    • https://telazavax.weebly.com/uploads/1/3/4/7/134729689/5194893.pdfIn PDF document text
    • http://vash-fasad.live/guess_the_song_challenge_1970_to_201933su9.pdfIn PDF document text
    • https://moxidoneke.weebly.com/uploads/1/3/5/9/135993461/vobowis-watawizikunezen-ferewatewazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_600a2399978ba.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/zedudo/58001728455.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/guvowidulosudafigowaked.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/cml_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/2605050503.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/90603901900.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/cisco_nexus_aci_ordering_guide.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_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 5436 bytes
SHA-256: b5af947072d470aac727cea52ef4a35b0f7534d72041357b25c1f7ecd094d4ac
font_01_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 10444 bytes
SHA-256: 6d174f74a00f4db289c8ef296593a8a5f5a25a412aae0e33556cc814708ed464

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