Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adc3d87c16a11f4…

MALICIOUS

PDF

80.9 KB Created: 2021-03-04 19:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bbc32f0206b87512a74a949cf6731904 SHA-1: ae369ef09ca0314b4e9ff851c00e7e0cf0c8d801 SHA-256: 8adc3d87c16a11f4eba80afc771cf1a09dbcbc0423406e7b35856cd30057732e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specifically uses a 'utm_term' parameter suggesting a phishing lure related to 'air force academy online classes'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 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://resalured.ru/strik?utm_term=air+force+academy+online+classes PDF link annotation
    • http://topdouche.xyz/google_sheets_if_cell_contains_numberxp47y.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/gjO3haX/games_online_to_play_with_friends.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/gizmos_calorimetry_lab_answersjp9ky.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/cUZhiVO/56322254918.pdfIn PDF document text
    • http://mail-autoscout24.net/jujibajesawunipizopew12207.pdfIn PDF document text
    • http://missunik.space/zepumukatezunimifiq52v.pdfIn PDF document text
    • http://velesvoyage.ru/functionalism_william_james7tfjo.pdfIn PDF document text
    • http://small-italy.space/91506317825toxse.pdfIn PDF document text
    • http://retamos.mygamesonline.org/why_did_the_bear_attack_in_the_revenant.pdfIn PDF document text
    • http://yblda.fun/tirowodajimotosidurujo86pw2.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/how_to_test_words_per_minute_reading.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/fQu8ixe/12272240348.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/adhitie/31026346187.pdfIn PDF document text
    • http://fruits-summer.fun/vobanaluxuzdo84y.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/idpOjdI/lawnchair_2_launcher.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/77942989131.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_5ff8e79c621941089edb86de7adc5195.pdf?index=trueIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_faf0d38eaf724b5680070cb181fe078f.pdf?index=trueIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/crash_course_us_history_29_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/31945567451.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_3d1b5ce3143442cd8489348cb1709719.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_73918cf2c902494da37ffe3ef5d4d33e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/chromatography_activity_worksheet.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_7942b36df44d4a63b517fafdfb8d5ca5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/27695523489.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/the_gospel_of_wealth.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_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 5256 bytes
SHA-256: c2b1713a1e489cd71442c22a232eb690f7641b01dbc5d84d403bf15b2658f211
font_02_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 11284 bytes
SHA-256: 546f758bd74342686885afe628b33196de0070964394ae0d4a00cab0fd1de99d