Malicious PDF — malware analysis report

Static analysis result for SHA-256 625bd357588fc6e5…

MALICIOUS

PDF

77.1 KB Created: 2021-04-15 21:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f896768cedac0622b2013d9a3008648e SHA-1: 3071d719266ab58888112cdd059fdf5862177089 SHA-256: 625bd357588fc6e58768d1d38cb16bfb7fef7cce95a5985226f1e91a8ec87e5b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to distribute traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's used to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=how+to+read+malazan+book+of+the+fallen PDF link annotation
    • https://cdn.sqhk.co/sewadokoka/Dgcjjjh/define_true_democracy.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/Yifhiji/angel_stone_rpg_mod_apk_5._3._2.pdfIn PDF document text
    • http://xejevojesinil.22web.org/tefenegurixulukulin.pdfIn PDF document text
    • https://cdn.sqhk.co/soleximu/hghijfq/nasamedinunupili.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/lgPXibY/sezenaxileganunabalexoda.pdfIn PDF document text
    • http://solokovalafewo.iblogger.org/70055170056.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/c15icTN/jenelufilita.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/o99esZJ/sizijo.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/bSgidhf/qatar_stars_league_computer_predictions.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/hegdd0r/bike_rider_helmet_camera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_1779118a7c024739b7da46857d16ac51.pdf?index=trueIn PDF document text
    • http://bidovug.rf.gd/cps_calendar_2020_19.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_96d77a9ca01048f4b197bb88ebd78608.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_991764a402be4dfbbba100e38f48f717.pdf?index=trueIn PDF document text
    • http://memuwalarike.rf.gd/rhythmical_excitation_of_the_heart.pdfIn PDF document text
    • https://7dad073a-5858-4d13-bf35-a645d3acb044.filesusr.com/ugd/71e439_d39cf2b1d3284168aea7436a97d84918.pdf?index=trueIn PDF document text
    • http://wevosowenafa.epizy.com/91225917331.pdfIn PDF document text
    • http://xaduwefel.rf.gd/72110054936.pdfIn PDF document text
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_3e0cfada9e2b4e559a591465e14c6403.pdf?index=trueIn PDF document text
    • http://jagogapibibolin.epizy.com/rosary_guide_tagalog_friday.pdfIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_2577721eaac6400cab528ea5090ad944.pdf?index=trueIn 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_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 5276 bytes
SHA-256: 164590b8fa8ccb1a782e73c46bc6ffb458caad880fba08b3379c1efc082ca27b
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 10844 bytes
SHA-256: 69fa8df0db80dc8d2a7a3a26927ad358478bdeb8f8103c357846680bde15c01b