Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d50f053d885f3c5…

MALICIOUS

PDF

95.4 KB Created: 2021-05-14 18:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 668f1cb03443ca452ca32ca6166f649e SHA-1: 5995fcc7de537caf39655eca89369aaa6e48a99a SHA-256: 3d50f053d885f3c542abf2e51abd3bf84f5508d61a0e92cc2b43a60c82862981
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the presence of numerous URLs and the heuristic firings point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=why+is+40+days+significant+in+the+bible PDF link annotation
    • http://zespodsvetkoy.site/john_deere_mower_dealers_ukooz3o.pdfIn PDF document text
    • http://brettlockhart.com/stickman_parkour_game_download_for_pc6bhwd.pdfIn PDF document text
    • http://leqqurint.online/74376238501nf4u8.pdfIn PDF document text
    • http://tevfikyuce.xyz/dotugacltd2.pdfIn PDF document text
    • http://samelike.site/bezaxog746oh.pdfIn PDF document text
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/lewozakowu_jaralutetakos_bagujusises_kelepu.pdfIn PDF document text
    • http://vafenofu.22web.org/difojaxodomejidujufodojun.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/6e7830d10f320.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/sinonus.pdfIn PDF document text
    • http://zoosalon.org/story_of_beauty_and_the_beast_in_hindi1e4ph.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/bafububekimide.pdfIn PDF document text
    • http://huseyincanx.com/28356877885djowu.pdfIn PDF document text
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/7051256.pdfIn PDF document text
    • http://price-list.moscow/rosumoroxit03wgk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuvepagigifu.rf.gd/jeep_repair_center_near_me.pdfIn PDF document text
    • http://xumutopefar.rf.gd/jukujenuxanepapemaduvaxer.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_3844479366904c59b1678408d0a79fca.pdf?index=trueIn PDF document text
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_748c95d19dbf4be0bab5d4257a12d417.pdf?index=trueIn PDF document text
    • http://muzudamufuvase.rf.gd/specialized_team_bike_computer_manual.pdfIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_85f67552e6a44264b7a44eedc46584d3.pdf?index=trueIn PDF document text
    • http://nojatajof.rf.gd/jutaxunodat.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/what_is_a_loop_in_programming_language.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/calculus_early_transcendentals_7th_edition_solutions_manual.pdfIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_5f5cd4cf5d16404ebc4b738fb39ac96b.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_0e3a8d8d53494fd48fe53e31184018b2.pdf?index=trueIn 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_off000132bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 5672 bytes
SHA-256: 57a481a990e8a72438617e190ee257b07ec294fad91f2a40d685fc413006c3e0
font_01_sfnt_off0001462e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462E 11752 bytes
SHA-256: 30d5eb8a3e030cd60b063cecb67b71d63bdc8880154e5cf6bd271430a71f1bdd