Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf42154de233420c…

MALICIOUS

PDF

73.0 KB Created: 2021-05-08 01:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f75a8ac0bc57c7a9b43b82de8e79a7b8 SHA-1: 7c45c2c71cbdc313983a49ee011a82b7ac7191b1 SHA-256: bf42154de233420c980341d094c9f28b43ca688f3a92be402d8088d04dc051ab
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary one leading to a suspicious domain, likely serving as a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to sending a letter, which is a common tactic for phishing campaigns.

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://lozipotod.ru/strik?utm_term=how+to+send+a+letter+return+to+sender PDF link annotation
    • http://bt-management.website/lanixivuvogomawaseriseru4crqa.pdfIn PDF document text
    • http://socialwave.me/ets2_realistic_graphics_modq38mp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493610/normal_60073499a5ae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_6017157e46d46.pdfIn PDF document text
    • http://fakaripeti.xyz/a_breath_of_snow_and_ashes_amazonfc8oo.pdfIn PDF document text
    • http://hotita.space/guvipovoxizax57g4i.pdfIn PDF document text
    • http://alisabor.design/how_to_open_graco_fastaction_stroller2azu0.pdfIn PDF document text
    • http://prizinsta365.site/cute_animal_coloring_pages_to_printrpmzv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5fc9aea648e73.pdfIn PDF document text
    • http://copyrightviolationcenters.com/givimojej8vytq.pdfIn PDF document text
    • http://feruwikabi.iblogger.org/45002830544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_6043bfec46725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_600c503e4938c.pdfIn PDF document text
    • http://bristol-yalta.run/online_tib-e-nabvi_in_urdupxl3i.pdfIn PDF document text
    • http://lbaranaydin.com/midland_walkie_talkie_gxt1000gkl8t9.pdfIn PDF document text
    • http://sovetnik53.ru/are_bosch_washers_any_good9p9tc.pdfIn PDF document text
    • http://clipshd.design/netgear_fast_ethernet_switch_fs108_ip_addressreavu.pdfIn PDF document text
    • http://discovljzg.fun/shooting_drills_for_accuracy9xjuy.pdfIn PDF document text
    • http://azorocheat6.xyz/zekadakipab1vvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwegovufa.epizy.com/gallbladder_polyps_treatment_guidelines.pdfIn PDF document text
    • http://jinonepi.epizy.com/93616982731.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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 4872 bytes
SHA-256: d17a69ea3bc2b3a4b16b61952c7be78e39b035084366db95797aefefa1063454
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 10268 bytes
SHA-256: b8fa0f32069abb6467c74884ce36138c4d5c939ac68325336842c44c8beb23b8

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