Malicious PDF — malware analysis report

Static analysis result for SHA-256 16426ec2afeb03c9…

MALICIOUS

PDF

74.8 KB Created: 2021-05-16 19:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3b9862a17919f85965057dc89a8a23d8 SHA-1: c915b723ceba8cdf87cb456b293b2ad5237d7f63 SHA-256: 16426ec2afeb03c9af0d33b941f236ffc9e7bcc65ec0a8808a3b2a4426860aef
166 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one to a domain flagged as a link farm on disposable hosting, and another to a randomly generated URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous URLs and the heuristic firings suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zajinet.ru/strik?utm_term=how+to+check+ink+levels+on+hp+officejet+pro+6970 PDF link annotation
    • https://gonedosi.weebly.com/uploads/1/3/4/7/134730609/09218a6a39e.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/wHifgzx/super_mario_run_world_4-_1_purple_coins.pdfIn PDF document text
    • http://ital-tess.space/jifazonuro2oz34.pdfIn PDF document text
    • https://vonosupaxeme.weebly.com/uploads/1/3/0/7/130740497/890516247.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/dezogoxugodokoxizoti.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/ig2igMK/shadow_aggressive_inline_skates.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/gre_test_at_home_costkstzs.pdfIn PDF document text
    • http://fitokaps.xyz/application_of_nanotechnology_ppt_freeuopls.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/pejuxovujere_gelejoje.pdfIn PDF document text
    • http://tameenegypt.com/hamilton_beach_ice_cream_maker_recipes_strawberryqwxcn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwosajew.rf.gd/importance_of_working_capital_management.pdfIn PDF document text
    • http://moxododokojuke.epizy.com/king_bookcase_platform_storage_bed.pdfIn PDF document text
    • http://ninukak.epizy.com/18845891254.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/is_p90x3_yoga_good.pdfIn PDF document text
    • http://pepajefosub.epizy.com/addiction_severity_index.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/bugugaxafofogujadiken.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/cstephenmurray_conservation_of_energy_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/tipodexedopebajef.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/vedefedekorerume.pdfIn PDF document text
    • http://wogomud.epizy.com/50169302269.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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 5676 bytes
SHA-256: 16a7c63b3219830a2996bf803230851355afebac99bae11d864d0bfed80800a0
font_01_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 10452 bytes
SHA-256: 9c019d08349f111e88f61a9a73000ef79f82c012406d3b4cc3ae956f228f9b80

Open this report in the interactive analyzer, or submit your own file for analysis.