Malicious PDF — malware analysis report

Static analysis result for SHA-256 151f8be784aabc7e…

MALICIOUS

PDF

73.5 KB Created: 2021-04-05 07:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3faedea29a1a66d0324fb6c7f3d961bb SHA-1: 2092873af835d530e600cf959fff0694f4e9c83f SHA-256: 151f8be784aabc7e5122953cdcab3f09dc2f68617dee75879650ba36446f4dbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://nipisod.ru/strik?utm_term=bosch+500+series+washer+dryer+stacking+kit PDF link annotation
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/jafiluturoro.pdfIn PDF document text
    • https://vurodotug.weebly.com/uploads/1/3/1/4/131454057/2226630.pdfIn PDF document text
    • http://eurostore.info/qsc_rmx_1450s79iv.pdfIn PDF document text
    • http://saratov.ooo/bidekopewusowufolefacfp.pdfIn PDF document text
    • http://parkji5x.xyz/weber_grills_cyber_monday_2020qvlgx.pdfIn PDF document text
    • http://prosucre.pro/how_do_i_fix_my_lenovo_battery_not_chargingavhdn.pdfIn PDF document text
    • http://pubguckazan.com/93755992741xtivo.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/kujuwarimumujaxivi.pdfIn PDF document text
    • http://italysummer.space/mutimamofotnnq2.pdfIn PDF document text
    • http://reduslim-italiaofficial.site/kepifoxunotusaxiwopi2g002.pdfIn PDF document text
    • https://nabozuritofawun.weebly.com/uploads/1/3/1/8/131857241/vazakelalaji_nuxegirisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_53a243c8fd01462eb5f4e3a75adf5646.pdf?index=trueIn PDF document text
    • http://buvodomugefun.rf.gd/astral_upvc_pipes_price_list_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a19d1f-e1dc-4174-addf-b5f31c859793/can_i_connect_ethernet_to_ont.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_e7a84e3f28514621b7b95fc8093a4fd6.pdf?index=trueIn PDF document text
    • http://sidakofonol.epizy.com/maschine_mikro_mk3_ableton_live_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144c6b23-ad7b-418f-9b8c-f2de01080cd2/how_to_spot_a_fake_baofeng_uv-5r.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_6ab2ea4482fe41daabd2c37453968044.pdf?index=trueIn PDF document text
    • http://lefarobi.rf.gd/esl_business_english_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42bc4d2-a1b9-4014-839f-cf69a3bf3f25/delonghi_dds30combi_dehumidifier_review.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_b457e9d1ffd54b82a69e37dd922ce677.pdf?index=trueIn PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_09fe8ca540a1460e9167615536740d0d.pdf?index=trueIn PDF document text
    • http://rupevapunalude.rf.gd/adverbial_phrase_worksheet_for_grade_3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 5532 bytes
SHA-256: 32e5979d21112fa28e45b8df4757be730af3ebde07f64e696eb89b4496cbedb3
font_01_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 10284 bytes
SHA-256: c76328768417d7dff5c7eb7db74adb563a5c081638a8669da5590c5c175bb532
font_02_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3