Malicious PDF — malware analysis report

Static analysis result for SHA-256 359617ec50fc3ad4…

MALICIOUS

PDF

81.3 KB Created: 2021-03-08 23:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 370ac83704b7d27c2f326348e0b6dfbc SHA-1: 7c855592fb6f740e57da16c3bf3db7f8f918abca SHA-256: 359617ec50fc3ad4bc139cbc8125e474cefc76437426f974942ea9df87e16abf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one key URL, 'https://jottigo.ru/123?utm_term=audit+sumber+daya+manusia+pdf', is flagged as unknown and is likely part of a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jottigo.ru/123?utm_term=audit+sumber+daya+manusia+pdf PDF link annotation
    • https://devuxitimon.weebly.com/uploads/1/3/4/5/134596282/seziwarugeb.pdfIn PDF document text
    • http://bopofefolinaw.22web.org/latex_template_master_thesis_eth.pdfIn PDF document text
    • http://lunotikipadul.66ghz.com/logozawob.pdfIn PDF document text
    • https://vedatirujoxe.weebly.com/uploads/1/3/1/6/131606280/45d8715b72669c.pdfIn PDF document text
    • http://zigamesixeviru.22web.org/bijaluguzedapexowanugi.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
    • https://s3.amazonaws.com/dazuxujepov/phonetics_and_phonology_linguistics.pdfIn PDF document text
    • http://mutexuwe.epizy.com/bahubali_2_tamil_full_movie_3gp.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_9770c453d22645ee971372538a6696d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/varofonuremisabuva.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/90803529153.pdfIn PDF document text
    • http://madepug.rf.gd/trader_joes_fearless_flyer_christmas_2020.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_26207a04cb924e66a91a4b82b62f847b.pdf?index=trueIn PDF document text
    • http://zuwemanikipe.rf.gd/python_dictionary_change_value.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/funowo.pdfIn PDF document text
    • http://gubogur.rf.gd/fexidokarexeker.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/how_many_calories_in_a_restaurant_chicken_soft_taco.pdfIn PDF document text
    • http://lisodibediv.epizy.com/34285977076.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/the_end_of_the_f_world_comic.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/jawevirob.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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 5156 bytes
SHA-256: 359a8f8612373a11824fabdb715a604c44184807daff49ec3d428eb439bc3c0b
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 10552 bytes
SHA-256: 865650c9ff3eaafaa084d1deb1e46dbc77501638a2b276f72ccc533927c57e26
font_02_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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