Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b7c72330f7f37c…

MALICIOUS

PDF

193.6 KB Created: 2021-03-31 06:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 30ab19b1242519886736e150be143c57 SHA-1: 5fcaadd091513d830afa8d51fe5e92c58f2d56f7 SHA-256: 90b7c72330f7f37c7f5dfee7bd089037be811dd5b7a153e30fbd511cf7741bd8
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the overall detection suggest an attempt to redirect users to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=acapella+hymns+sheet+music PDF link annotation
    • https://cdn.sqhk.co/lalamiteliw/rgehcxG/bovozige.pdfIn PDF document text
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/jogubomotujos-fusofamuzugug.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/speed_queen_commercial_heavy_duty_dryer_heating_elementpvmvr.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/iwligii/virgin_mobile_ksa_recharge_code.pdfIn PDF document text
    • https://moninedowilex.weebly.com/uploads/1/3/1/4/131436981/direpelifiselediruja.pdfIn PDF document text
    • https://gibetixogi.weebly.com/uploads/1/3/1/6/131636946/f3f1196622.pdfIn PDF document text
    • http://fastpysystem.online/87077828093cxlro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a9765d-c433-45eb-9625-7d353b9c41a2/what_is_good_for_calluses_on_your_feet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bf12cc-7507-45cd-9e67-340cfa1ba35d/93288316109.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/translating_grandfathers_house.pdfIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_bc159d00817348bc930cc9ef45666e68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6435299f-1b61-4d9c-9bba-91e0005663d7/why_looks_are_the_last_bastion_of_discrimination_style_and_structure_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/elijah_of_buxton_chapter_18_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/carry_on_jatta_movie_songs_hd.pdfIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_d67537e03add4a2c886871101b1ab3e4.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_cb1ef0e4b4074a63baf54272fbd37fcf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1829bfb3-75ae-4367-8d6d-875ee6a082de/jquery_video_tutorial_for_beginners_with_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/english_vocabulary_words_book.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_35e7202b56a84d13be4e32f1bf794559.pdf?index=trueIn 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_off0002c20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C20A 5168 bytes
SHA-256: 99d26f7c414d5faf7441f3708b53a8f24718ae3832280de2bd05a08a8b04770b
font_01_sfnt_off0002d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D381 10948 bytes
SHA-256: 22d46acf024db6377177a5bee8ac9dd8ae6d4176d1d55f33a78bac2474159ac8

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