Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fedf7d2f69e0450…

MALICIOUS

PDF

73.9 KB Created: 2021-03-01 18:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36a8a2976f6de68414e89fd2746f93da SHA-1: e5538a3102c70d6a8f5b396353d0b1625e4f9a00 SHA-256: 4fedf7d2f69e0450f95c2b4f9e5c4b9a64f2ed0084818beb341800ec52dc016b
136 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest the document is designed to download and execute a second-stage payload. The document body, though heavily obfuscated, contains references to 'curl.pdf' and multiple URLs, reinforcing the payload delivery hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://druttle.ru/wix?keyword=rare+unidentified+gear+gw2
    • http://tewatag.medianewsonline.com/morodevenaleso.pdf
    • http://mitimewigupito.mypressonline.com/python_deep_learning_tutorialspoint.pdf
    • http://luferuvijudadof.22web.org/19462329636.pdf
    • https://rikizanasurixa.weebly.com/uploads/1/3/1/3/131379420/7a8f772.pdf
    • https://xobugozo.weebly.com/uploads/1/3/0/7/130739897/62d9b700e49.pdf
    • http://zalixunepujo.22web.org/demographic_information_in_research.pdf
    • http://fafijitesulexiz.mygamesonline.org/rexenefamemumotevufuz.pdf
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/bebunabin.pdf
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/fdd5b815c51c.pdf
    • http://luvozoredola.iblogger.org/12981661487.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wexugemo.epizy.com/gateway_2nd_edition_b2_answer_key.pdf
    • http://nexisaxilesa.rf.gd/bosch_tassimo_joy_instruction_manual.pdf
    • http://nenigira.epizy.com/zozidikizerelaso.pdf
    • http://voniziveput.rf.gd/27468397191.pdf
    • http://jisijuvod.myartsonline.com/resistance_band_seated_bicep_curl.pdf
    • http://kowejanaf.rf.gd/43465787756.pdf
    • https://s3.amazonaws.com/legipalofi/301_1_2_hard_stainless_steel_sheet.pdf
    • http://votepawawirinu.rf.gd/72682188509.pdf
    • https://s3.amazonaws.com/vifusupegiza/38602755753.pdf
    • http://divupovive.epizy.com/dyslipidemia_guidelines.pdf
    • http://vajipiposugeto.rf.gd/xegajivosusifidotip.pdf
    • http://sabuxixu.epizy.com/fejonuku.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/aristoteles_gran_etica.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e617.bin
df1c7df24aa6cddb7cb4356d3c4f94739118add73bda43453c07700953e94af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 5096 bytes
font_01_sfnt_off0000f79b.bin
913ef5dc511fd1a25f5efc524dee264781e4e16bea7870824a2494f926444a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 9984 bytes

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