Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc57091e6a9114a8…

MALICIOUS

PDF

82.4 KB Created: 2021-03-10 01:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 929930691feceb0896c0435ec89c3dec SHA-1: 518a1bedeb44d7d93d5290c46fb31d1f5d07bd72 SHA-256: fc57091e6a9114a8f7c72627c94eb5f9b60b0451e17bfb7dd922300ff07555f9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that redirect to various PDF download links, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/award?keyword=old+man+and+the+sea+bangla+pdf+download PDF link annotation
    • http://rimiripa.mypressonline.com/nexaki.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/hihajfF/world_war_dates_1_and_2.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/aOrhjgd/kimogaxepemawaxul.pdfIn PDF document text
    • https://cdn.sqhk.co/konosoka/ehaAUiI/tulilikotejubevupoma.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/76252615958.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/j3RjbeC/77050036482.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/bEifC2C/free_live_police_scanner_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/iiVlhdI/47798387203.pdfIn PDF document text
    • http://mimivamefigupe.sportsontheweb.net/current_affairs_january_2020_in_english.pdfIn PDF document text
    • http://wabiferofuvud.mygamesonline.org/i_want_to_buy_an_existing_small_business.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/what_did_the_elephant_man_die_of.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/hfsJghb/motorbike_track_days_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/zifegowuf/cyjcK4K/arknights_apk_bilibili.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/beats_studio_headphones_black_friday.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/zaniwivonunelatuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/kiswire_co_ltd_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/grim_dawn_forgotten_gods_best_builds_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/dalisabisalumopow.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/hunter_pet_dps_classic.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/how_to_reset_samsung_sound_bar_subwoofer.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 5616 bytes
SHA-256: 8618a85f122e4ab51fe97a924c4be660adab67b4ee600280c0e2d11407248323
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 9092 bytes
SHA-256: 45b94b8322305b52f2a66b01c75866bebac2d44beaa293d0ead85876a96dffe1
font_02_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 10036 bytes
SHA-256: fbd0c463bed574ad53f46fbcefd1810f29277837d62757a35099c4bc5d623375

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