Malicious PDF — malware analysis report

Static analysis result for SHA-256 86871f28c32d1208…

MALICIOUS

PDF

86.7 KB Created: 2021-03-11 19:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b0ddf1a454b85ae85b6c50328b4cbfa SHA-1: 83ae06de35455e9cbd3d0d18e85549ec49c68b80 SHA-256: 86871f28c32d120826ee10dbe26ad1f10606d2327c7704bbc5d897c9c90017a0
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9995

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://jumiwimov.ru/123?utm_term=laporan+asidi+alkalimetri+pdf PDF link annotation
    • http://mobeditobaxul.scienceontheweb.net/61661133011.pdfIn PDF document text
    • http://repovor.22web.org/android_support_library_different_versions.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/fesonosatemebijaduti.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/54bb5506d31.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/jgehjvT/financial_times_newspaper_review.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/76662583055.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/nebovak.pdfIn PDF document text
    • http://xodufaviwez.iblogger.org/the_hunger_games_mockingjay_part_1_watch_online.pdfIn PDF document text
    • https://cdn.sqhk.co/takodabu/jijamjj/jomigenivimokipex.pdfIn PDF document text
    • https://newavutija.weebly.com/uploads/1/3/1/8/131871734/0fd998c14.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/4735744.pdfIn PDF document text
    • https://vexalujonesudu.weebly.com/uploads/1/3/4/7/134738084/858d0294b367703.pdfIn PDF document text
    • https://nazalufu.weebly.com/uploads/1/3/1/4/131409274/vutexevilenumisa.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
    • http://losuwanawore.epizy.com/online_7z_extractor_and.pdfIn PDF document text
    • http://letozin.rf.gd/doggcrapp_training_exercise.pdfIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_4c26f9b189f9463094e89eec18f9b8d5.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_cbd3968ff71d464eabdf0ad849e6e9aa.pdf?index=trueIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/why_ct_short_circuited.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebde3c5-47f0-47f0-9154-ddaffbb98e1e/xagukanorijibibonovak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a299a2ca-a580-4d2e-8bea-3f22510def24/xunuj.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_484cf4e0fdd64feeae6eaddf901601b2.pdf?index=trueIn PDF document text
    • http://migumirokive.epizy.com/does_bully_dog_gt_tuner_work.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_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 4980 bytes
SHA-256: c7ce5032d8bb1ec4737756d01a9aeace35deef67001fac7bf9570ed6e3d72e53
font_01_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 10988 bytes
SHA-256: 167e42ac9465cc4a5e1bbc3ca9ef140e1364168d999e98f619eed4e0a5168c88
font_02_sfnt_off00013f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e