Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e401e5660bef711…

MALICIOUS

PDF

84.1 KB Created: 2021-06-01 08:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed1a9a7d8736960d2f66aed31b648a79 SHA-1: b2775f79b9b721cdfb00fa4f5a93b8ada893e20d SHA-256: 1e401e5660bef711420ed04c1aae1cae5cc2fa1825a02479817988cba5eb55d0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The primary URL, 'https://garglob.ru/pbw?utm_term=erdas+imagine+2016+free+trial+download', appears to be a lure for software downloads, which is a common phishing tactic. No scripts were extracted, but the PDF structure and numerous external links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • 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.
  • 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://garglob.ru/pbw?utm_term=erdas+imagine+2016+free+trial+download
    • https://gakubuzavesow.weebly.com/uploads/1/3/0/8/130813888/penerewuzagixok.pdf
    • https://jiwamotezonadiw.weebly.com/uploads/1/3/4/3/134325797/c59b4683604e.pdf
    • https://voxuvuru.weebly.com/uploads/1/3/5/3/135390020/b4b923467de.pdf
    • https://duzejuwilana.weebly.com/uploads/1/3/4/8/134879611/3764605.pdf
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/lajewusiseta-tevubovig-lubuxisu-kelinazapegezid.pdf
    • https://nupariredarig.weebly.com/uploads/1/3/4/3/134357859/zudiruxakipamus-kogizudiwixukig.pdf
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/1959135.pdf
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/neredidavigek.pdf
    • https://dofetavazazu.weebly.com/uploads/1/3/1/0/131071127/68fd02e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zikasamu.pbworks.com/w/file/fetch/144434193/bozagiw.pdf
    • http://jesababa.pbworks.com/f/kalimas_in_roman_english.pdf
    • http://sazupamufode.pbworks.com/f/85299276949.pdf
    • http://mikabipi.pbworks.com/f/vofowixofulaguv.pdf
    • http://fufitiruw.pbworks.com/w/file/fetch/144426672/how_do_i_update_my_moultrie_camera_firmware.pdf
    • http://kiletejude.pbworks.com/w/file/fetch/144427806/kozufajudira.pdf
    • http://bovozajezo.pbworks.com/w/file/fetch/144440238/novid.pdf
    • http://wisarazed.pbworks.com/w/file/fetch/144441519/41248144676.pdf
    • http://bovojigu.pbworks.com/w/file/fetch/144420165/winter_horse_feeding_advice.pdf
    • http://bemulopawed.pbworks.com/w/file/fetch/144447636/ronelufedotasos.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144418746/how_to_put_onn_earbuds_in_pairing_mode.pdf
    • http://rimogeto.pbworks.com/w/file/fetch/144427779/33285906033.pdf
    • http://didaneguk.pbworks.com/f/wipobogofutamuxelulunebip.pdf
    • http://sinorodolu.pbworks.com/w/file/fetch/144445011/202076894.pdf
    • http://xojifot.pbworks.com/f/the_21_day_sugar_detox_yes_no_list.pdf
    • http://wuvebag.pbworks.com/w/file/fetch/144427191/tepixagosituxozidamafuz.pdf
    • http://kedetuwi.pbworks.com/w/file/fetch/144428055/how_to_test_insulation_resistance_of_a_transformer.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e7.bin
fadb0e31c364ac168b75a78b43e4ffe2f6246a8e263aa2ce433aeb669a69bc11
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 5544 bytes
font_01_sfnt_off0000f8bd.bin
6c35adfadbbae6dd78f3329cfccb207d600f64bb703f7697329de7e62f0a9f67
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 11284 bytes
font_02_sfnt_off00011e48.bin
0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 16168 bytes
font_03_sfnt_off0001334f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 4324 bytes