Malicious PDF — malware analysis report

Static analysis result for SHA-256 151d278063be1082…

MALICIOUS

PDF

90.5 KB Created: 2021-03-23 03:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d0ad490f0daec3a046d92a1712f92520 SHA-1: ce75c2157c24fab7d1714f3bf9f95af891b0afea SHA-256: 151d278063be10820374a093ebd11097a9b200415a08295d266fcf912f900945
236 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other domains, forming a link farm. One prominent URL, 'https://vilenefex.ru/wix?keyword=entry+level+healthcare+business+analyst+resume', acts as a redirector, likely to deliver a phishing lure or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/wix?keyword=entry+level+healthcare+business+analyst+resume PDF link annotation
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/4317712.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/3494253.pdfIn PDF document text
    • http://remastacer.com/7498079825919gry.pdfIn PDF document text
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/dirofuvilexez.pdfIn PDF document text
    • https://golotewojedonam.weebly.com/uploads/1/3/4/7/134767862/9069a5b75f9.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/nuwemotalojelet_nedovemujikomok_sejolasoxerit_ludisajenuwa.pdfIn PDF document text
    • https://wizawexixif.weebly.com/uploads/1/3/4/4/134472694/joxalufebubu_zibuzo_jelaravip_setaximosedu.pdfIn PDF document text
    • https://firikanafumofud.weebly.com/uploads/1/3/0/9/130969048/bivulafu.pdfIn PDF document text
    • https://danaguvofuboxi.weebly.com/uploads/1/3/5/4/135401293/tazokekewejune.pdfIn PDF document text
    • http://wiwikiru.iblogger.org/burner_us_phone_number_apk.pdfIn PDF document text
    • http://nisebitedogofu.iblogger.org/75058147888.pdfIn PDF document text
    • https://xobiduri.weebly.com/uploads/1/3/1/4/131437628/4ba2233c3f41e.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/9451131.pdfIn PDF document text
    • http://retys.space/skyworth_smart_tv_50_inches_review8qqpk.pdfIn PDF document text
    • http://relax35.ru/witawujubofumine8qe6f.pdfIn PDF document text
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/2c0d5a44d1b.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/e085ac6d1668336.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/zuxime/filmic_pro_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/free_guided_meditation_script_for_healing.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/how_heavy_is_plastic.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/android_games_not_in_play_store_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/minakajefotukumefupakud.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_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 5072 bytes
SHA-256: 3158128990caa7ff89150a2e2507142badfce43dd144fce455febf9ea50f4ef9
font_01_sfnt_off00012b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B28 10336 bytes
SHA-256: 473b842e6bee9596a20841bd568294072d30bf62922f30b27d56d236480af69c
font_02_sfnt_off00014e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E78 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3