Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e843587841e3f6…

MALICIOUS

PDF

68.7 KB Created: 2021-02-20 14:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c36327bb360028140602f8679a911008 SHA-1: 2a0f3196bdbc5f33526c960071f98955e8effd3f SHA-256: a1e843587841e3f685d45fede3ca27f4138f3ee64f3c2b9f6f2b580f02b4ad40
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=medium+powerade+slush+sonic+calories PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448339/normal_600c7024df4b1.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/e2f5a8ca11cbc79.pdfIn PDF document text
    • https://cdn.sqhk.co/zavufepugife/ahdKicQ/werewolf_online_apk_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/i2pUUje/music_volume_eq_apk_old_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_6012620e92684.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/Pjghiii/xurekafuzoxawaxaku.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/cfUifif/ball_slider_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuvobu/vjcjbih/download_meetme_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/NqhhhiN/color_me_rad_5k_pittsburgh.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegase/jjeggeI/42880403492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404727/normal_5fdfb984c8c6d.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/hcvhfwu/t_i_gacha_club_download_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zusevamasor/pojewegipisedulogip.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/genogram_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/lidowi.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_off0000c351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC351 5212 bytes
SHA-256: c00ec2db3cee713d36475f2095da02853f5a7f380a5851f71dc647cc731999ce
font_01_sfnt_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 10048 bytes
SHA-256: 7adddc841e0f438e213a553eb34b79330ffdb33a0d21b0e89a2a484f43064f54
font_02_sfnt_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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