Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaf3733dfa440ee…

MALICIOUS

PDF

122.8 KB Created: 2021-03-24 03:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9767304c61e6984dca88820eb19bb72b SHA-1: 7418ad5e03bd7fbae674e8d9f59b8d467b7f7e97 SHA-256: dfaf3733dfa440ee6e418759ca18df80772b7a08ee5ccb0480e46359bb53b83c
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 ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/award?keyword=design+patterns+in+swift+pdf PDF link annotation
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/9156131.pdfIn PDF document text
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/komudenomidon.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/pijamufixufowamijuvo.pdfIn PDF document text
    • http://mebotus.mypressonline.com/miller_trailblazer_302_for_sale_canada.pdfIn PDF document text
    • http://trells.space/how_to_grow_thyme_in_central_floridaaijat.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/vudiwugiviku.pdfIn PDF document text
    • http://tizezs.xyz/576333106704vbqt.pdfIn PDF document text
    • https://nulowuze.weebly.com/uploads/1/3/4/6/134614321/6353641.pdfIn PDF document text
    • https://jatuvukaxakepu.weebly.com/uploads/1/3/4/3/134313635/3806506.pdfIn PDF document text
    • http://sijuvibitita.iblogger.org/buddyfight_area_android.pdfIn PDF document text
    • http://shoop-fl.ru/vutamixazod4p2xm.pdfIn PDF document text
    • http://bluebadgeform.com/fetakozekudunajedon9uyj.pdfIn PDF document text
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/sogoket.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosawos.epizy.com/classroom_rules_template.pdfIn PDF document text
    • http://kanisisasulaba.rf.gd/examples_of_methyl_chloroform.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/68899696388.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/xinidumovanomifefivijep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce74dbe-99f4-4673-90ab-3d9dac656ffd/can_you_keep_a_secret_streaming_altadefinizione.pdfIn PDF document text
    • http://vagilamiporaw.epizy.com/asthma_guidelines_pediatrics_aap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b7edd6-c615-4d9a-8f96-00bbea8dd1a3/sivapuram_tamil_mp3_songs_free_download.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015901.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15901 21164 bytes
SHA-256: ab8fecd9d027781f394279384b64c45905554925007dfc563098cac32a541c52
font_00_sfnt_off0001332a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 5804 bytes
SHA-256: 7b48760e991b4ba07f68cb0ba71a570f1143e42c2af54556e32da00127569863
font_01_sfnt_off000146f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F1 5268 bytes
SHA-256: a73770e706840158d941d7611d055884b49d91a0aafbf96097442d4baf752e7b
font_03_sfnt_off0001997e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1997E 12164 bytes
SHA-256: 5736c2f2a63ba174397a216e5c3fc0ff94d5986a46cba4b4d30b7ad360c71e00
font_04_sfnt_off0001c325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C325 16888 bytes
SHA-256: 0cf22561544d1a5c173bc33f858be427e282eb36511dbc5b9c44f7e5ad251b96