Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cc6b86ff0e9138…

MALICIOUS

PDF

81.9 KB Created: 2021-03-15 23:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: efe2e3184444f12a60ec1c4207a5109d SHA-1: e98d2e42f66fa418c067456aefe8504de4c16001 SHA-256: 32cc6b86ff0e9138c9cabd30f760deae5f1a4c878899008645dcbd38196c056c
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL leading to a site that appears to be a link farm disguised as a resource for coding interview questions. This suggests a phishing or social engineering attack aimed at directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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=narasimha+karumanchi+coding+interview+questions+pdf PDF link annotation
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/kafujoxi_buviz.pdfIn PDF document text
    • http://lodorobirat.22web.org/korutowulitefile.pdfIn PDF document text
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/a4055ce2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481516/normal_5fe5a90d29356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_603aa27b12263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_6030757605f2b.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/49136410273.pdfIn PDF document text
    • http://jixelaxoli.66ghz.com/17675049459.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/33330b8.pdfIn PDF document text
    • http://wivupivipewezap.mygamesonline.org/mambo_west_side_story_score.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_601a15327edb1.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/zobiwe.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/gogonof/code_vein_depths_maps_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/will_5th_wave_have_a_sequel.pdfIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_11a51025d1a04bcb8095cdf093276e42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/besafefaf/honda_side_by_side_1000_accessories.pdfIn PDF document text
    • http://xujided.onlinewebshop.net/88202439595.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/98343894144.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/bavomifofesalon.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_c770687fd07d4f6ea7bd8963559d86e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuzamada/gowozukawemapimabafu.pdfIn PDF document text
    • http://mesuwirafifi.rf.gd/yo_amo_a_paquita_gallego_cast.pdfIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/will_there_be_a_season_2_of_girlboss.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_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 5728 bytes
SHA-256: dc2f4462e7bbfe3a9e2ba80fbb1a7eda652521a65422ff633435d794ebb30e2c
font_01_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 11016 bytes
SHA-256: 85aa6ac77251443dea700c727957715fd5b99ae838a4438cc26e3a75c114466c
font_02_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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