Malicious PDF — malware analysis report

Static analysis result for SHA-256 570b4a6741fe3ce7…

MALICIOUS

PDF

72.4 KB Created: 2021-06-13 18:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9ca899dbebded2d9f78a10aca3a71789 SHA-1: cdd7c9d116badd1d46648b07ed93a7182b7629ca SHA-256: 570b4a6741fe3ce7f6cc4596933ee195a7953d0a9de92bb3aba8ed7a0dfad4d1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://pistant.ru/pbw?utm_term=two+way+frequency+table+worksheet+answers PDF link annotation
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/777649.pdfIn PDF document text
    • https://tixasenuwafoja.weebly.com/uploads/1/3/4/6/134658158/ff8a828adee.pdfIn PDF document text
    • https://rapozudomemixu.weebly.com/uploads/1/3/5/3/135330029/84566.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/5d3cf.pdfIn PDF document text
    • https://wujuxibivotalo.weebly.com/uploads/1/3/1/4/131453464/1014369.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/2617618.pdfIn PDF document text
    • https://supaxusomit.weebly.com/uploads/1/3/7/4/137499206/dumobimerele_kebuwo_winalow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/40544ea0-17ba-43f4-ae11-f95644ca0fd0/canon_pixma_mx432_paper_jam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025a6165-4563-49e8-848b-390768de24f5/what_are_good_workouts_at_home.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144628194/wixodatu.pdfIn PDF document text
    • http://jadubunid.pbworks.com/f/44583740500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98216a8-4a3c-4f43-a2bd-77b7f71fe8bb/21077905012.pdfIn PDF document text
    • http://vakerul.pbworks.com/w/file/fetch/144510456/buwupomidoletujevu.pdfIn PDF document text
    • http://kalunagepigi.pbworks.com/w/file/fetch/144424902/bawanuvi.pdfIn PDF document text
    • http://lesotarizim.pbworks.com/f/fejimeniwowesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3f2ed6-634f-461f-adda-b7fbf1a96f9a/jbl_flip_5_charger_port.pdfIn PDF document text
    • http://kibarilotog.pbworks.com/w/file/fetch/145237488/hanuman_chalisa_narender_chanchal_mp3_download.pdfIn PDF document text
    • http://finebov.pbworks.com/w/file/fetch/144445539/orao_subordinada_adverbial_causal_reduzida_de_gerundio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2bb035-30fe-4417-8f0a-1e6e15450b79/julava.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144814869/financial_accounting_1_valix_2017_solution_manual.pdfIn PDF document text
    • http://xefepexa.pbworks.com/w/file/fetch/145135059/bebikanijigas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d2b2b5-5633-4bb0-8f85-62c4371a41fc/can_i_develop_android_apps_on_mac.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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 5444 bytes
SHA-256: a4627dac589e7a422bc5e47528e7bf0fb6fc97325a2b8319f43dcfa996dde83e
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 10700 bytes
SHA-256: 43ee2eb2feaa0f19c5c71cfb5fc528d818ad5690b2943c36aa86f9ef824749eb