Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae63690307525c61…

MALICIOUS

PDF

81.8 KB Created: 2021-04-03 14:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6a7f6c1e172ee863ed02569dfd7cc683 SHA-1: 522dc9915acce58447f5989eccf4fb9760f4d84f SHA-256: ae63690307525c61dfb7012a29bb0165ddb6c7656847344f2a5e0691a55df810
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as an external URI leading to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the redirection of users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://resalured.ru/wix?keyword=moto+g+screen+replacement+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485822/normal_6013863d84cf4.pdfIn PDF document text
    • https://cdn.sqhk.co/dikarulik/gijjbge/uidai_aadhaar_software.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416144/normal_5ff21049e97cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404745/normal_604695972ffc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_605df9e2c4f83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449766/normal_6004bd97ac405.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/Aicgjie/misevudolipinoxirim.pdfIn PDF document text
    • http://magonawaneku.22web.org/dabubuvigenenogesozonewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezunas.epizy.com/62270058126.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_168118c5579f46928b96bb3b135b8b14.pdf?index=trueIn PDF document text
    • http://zukewazidokik.rf.gd/58217782292.pdfIn PDF document text
    • http://rozibililev.epizy.com/how_do_i_reset_my_nec_phone_password.pdfIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_4b27bcf05d2140e686fef2003c5158a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/darogusej.pdfIn PDF document text
    • http://nivosifif.rf.gd/tafsir_surah_al_mulk.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/38792107937.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/36_questions_game_new_york_times.pdfIn PDF document text
    • http://novuvajuvenexe.epizy.com/lufadotarosokikanazagazit.pdfIn PDF document text
    • http://jexonuwunow.epizy.com/fun_run_boosterthon_prizes_2021.pdfIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_f0ba54b6cfc34f1d8fb09d890294dfd4.pdf?index=trueIn PDF document text
    • http://ravizovagusemav.epizy.com/breaking_the_habit_of_being_yourself_free.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_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 5396 bytes
SHA-256: 700585406c87780f2f7d81476cf9bd54cfd4f8bb1872aa1d7cc9741c864a9202
font_01_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 10976 bytes
SHA-256: 112371c65d726df9865ec41f09d1c2632397c1fe49889833de95631c9358b655

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