Malicious PDF — malware analysis report

Static analysis result for SHA-256 325bdd3a8909bb07…

MALICIOUS

PDF

87.7 KB Created: 2021-01-30 14:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7a08b4bf6e2d86cd80d9f24b506b2f9a SHA-1: 9b3e67711c591f536dd0d2f1dffa03a0329378c0 SHA-256: 325bdd3a8909bb0785952fa07aa6a9b05febce1405c663ba437d0820b299fb4a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://baarspo.ru/aws?utm_term=auxiliary+verb+pdf+file, appears to be a redirector. The document body is heavily obfuscated and contains garbage data, indicating it is not intended for human consumption but rather to host malicious links.

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://baarspo.ru/aws?utm_term=auxiliary+verb+pdf+file PDF link annotation
    • https://cdn.sqhk.co/noxibogalu/aRig222/viwapatuxav.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/jmhjIhb/forivevabojeximefilijokut.pdfIn PDF document text
    • https://bomobokoluv.weebly.com/uploads/1/3/1/4/131437025/19db0b0f3b.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/hejjjbd/shelter_2014_full_movie_free_download.pdfIn PDF document text
    • http://daravto18.ru/light_meter_sekonic_l-_208gfrqd.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/fOGidjf/koruwomefupuxituvonude.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/hhejbI5/epic_battle_simulator_2_cheats_ios.pdfIn PDF document text
    • https://tazojowilojema.weebly.com/uploads/1/3/1/4/131406386/208fc15a0a.pdfIn PDF document text
    • https://cdn.sqhk.co/loboremetoxe/hiajhgc/spin_the_bottle_online.pdfIn PDF document text
    • http://sasezifunapa.iblogger.org/aws_lambda_cloudwatch_log_format.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/hgh4jgi/dragon_mania_legends_apk_download_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/7iaKtgc/how_to_bake_pumpkin_seeds_with_butter.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/tajepopuwomojoz-takarupafel-nefananulaj-bewosoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/dotivaf/jujonazowoludezenus.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/96098224028.pdfIn PDF document text
    • http://worurekebisur.rf.gd/bitonic_sorting_network.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/bloatware_apps_android_xda.pdfIn PDF document text
    • http://fufezexu.epizy.com/gulilutemataxomifate.pdfIn PDF document text
    • http://givemuzod.epizy.com/jarlaxle_guide_to_traps.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 5216 bytes
SHA-256: dffe9f04179831201809a59948926511b68d2cd22fffeab897a80cc61e6de3e3
font_01_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 11076 bytes
SHA-256: ac3e8d2deef5dcf208842afd085647437c5b7db1f79494f2d0a8d521ec8f1e8a
font_03_sfnt_off0001303b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303B 10616 bytes
SHA-256: 2d05f88d7c03a9ceba8e5c259cdedfbc89d20d2724a6d852bb57cb982db7e0ce