Malicious PDF — malware analysis report

Static analysis result for SHA-256 63487a780b31263a…

MALICIOUS

PDF

73.1 KB Created: 2021-04-06 14:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bad98b10879d715492ffd290f249492d SHA-1: 867073e6952df6a37b7c130445fa1e54013bdda7 SHA-256: 63487a780b31263a310db504063419ae6e3a9cb454361aba1c76994f210b3ce2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to educational materials, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/award?keyword=understanding+and+using+english+grammar+4rd+edition+answer+key+pdf PDF link annotation
    • http://daravto18.ru/29320534337g233y.pdfIn PDF document text
    • http://goodxday.xyz/delta_table_saw_fence_extension7v2kv.pdfIn PDF document text
    • http://zavodtriumf.com/acko_bike_insurance7e5vq.pdfIn PDF document text
    • http://stixlife.info/mass_spectroscopy_applicationu7amm.pdfIn PDF document text
    • http://kengoru.space/beforexasi3eheq.pdfIn PDF document text
    • http://clientesdkb.com/friedel_crafts_acylation_on_phenolgeiy3.pdfIn PDF document text
    • http://normab-id.com/647195195847usq0.pdfIn PDF document text
    • http://hookup671.site/589004699256wulu.pdfIn PDF document text
    • http://gujafitixa.iblogger.org/analytical_mechanics_fowles_and_cassiday.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://didoruvevesipug.rf.gd/amoeba_sisters_video_recap_monohybrid_crosses_answer_key.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_aeb928949a434ce995d9e01428276eac.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_db71930dbe874959a78e069c98e687df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/480310ad-2381-4ad8-b23c-c636af6bb3a4/what_is_the_fastest_way_to_cure_chilblains.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f335567-2330-488a-95a5-0607897df183/puketaroletukejekagox.pdfIn PDF document text
    • http://vuzegemed.rf.gd/darujunifuxezibizep.pdfIn PDF document text
    • http://bopenakonaj.rf.gd/68543590034.pdfIn PDF document text
    • http://vaxazovalijulut.epizy.com/75249088912.pdfIn PDF document text
    • http://reluwiz.epizy.com/85256011916.pdfIn PDF document text
    • http://safagapoz.rf.gd/43916077959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c04e0aa2-641b-4c03-81b6-709a705306b2/diritifugumikariromumevod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42709109-1426-4189-aa7c-fb28afdfb03a/47768784395.pdfIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_21d3b89ffa474a89bd7f20b0714b37d0.pdf?index=trueIn PDF document text
    • http://lexalerov.rf.gd/canada_states_list.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 5792 bytes
SHA-256: e5afcf0510562a7ac0259cc718a2ad608920ce94d0405039bcf29df343344848
font_01_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 11200 bytes
SHA-256: 70174ddc80f0c9465654343cb47084941842c63b1f51e05f61cbdd91c613f4d4

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