Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8f6aab83051829…

MALICIOUS

PDF

69.3 KB Created: 2021-03-15 02:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 574460152b106d638fd5b8baf5ff51ce SHA-1: f597a0e2a31828fbd5f0780eae9799cb465a921f SHA-256: 1b8f6aab8305182943a0ce2ca097607f6a9bbec97762830b129f0058943e8f8b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. One prominent URL, 'https://midufefew.ru/award?keyword=number+theory+with+computer+applications+pdf', is directly linked to the document's apparent purpose of luring users to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=number+theory+with+computer+applications+pdf
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/muzulise_mitub_momupagenufoz_werulamobaxup.pdf
    • http://topmassage.net/629821852117ou3b.pdf
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/dixizojinenujip.pdf
    • http://zathkatow.xyz/american_gods_season_2_review_imdbj90sv.pdf
    • http://palupalukagu.mygamesonline.org/how_to_find_the_mass_of_an_element_in_a_sample.pdf
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/ec5d9a.pdf
    • http://leqqurint.online/ruregimotalivuzofowajudaj6a7m.pdf
    • https://xurexesezegurez.weebly.com/uploads/1/3/4/0/134096141/wuvetadivu_wazepoxonesoz.pdf
    • https://pogabivapiz.weebly.com/uploads/1/3/4/3/134327153/c0a4bb137d.pdf
    • http://texno3ua.com/reference_point_software_freej4adp.pdf
    • http://siviveko.getenjoyment.net/work_study_in_apparel_industry.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/donarepemi/28215113235.pdf
    • https://s3.amazonaws.com/genijusemu/touch_of_class_bedding_purple.pdf
    • https://s3.amazonaws.com/lakadutof/sudubiwuz.pdf
    • https://s3.amazonaws.com/fomaralunex/new_monster_high_movies_2020.pdf
    • http://radopafoxewu.rf.gd/encyclopedia_of_agrochemicals.pdf
    • http://widagutevutedik.epizy.com/82667763782.pdf
    • https://s3.amazonaws.com/lebejos/avatar_2_tamil_dubbed_movie_free.pdf
    • https://s3.amazonaws.com/gapivegek/9468141184.pdf
    • http://fubavinexazixo.onlinewebshop.net/17047351811.pdf
    • http://vigavanoxe.onlinewebshop.net/cancer_de_esofago_tratamiento.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a6.bin
1750238316bddabaa1f9acb9c3345e992f353432780debc8513604b28897e4ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 5696 bytes
font_01_sfnt_off0000eaf6.bin
a73ef463db0701a4438fb1751ae082b05f7e4410a1d31df371c1d1ddecc948bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 10672 bytes