Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef10e48ba09abf53…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 03:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ccc4a8e4fc2aa6ddb2f2dad3e1435b13 SHA-1: 2024899692e3c6cd85cee7d022de7a786a7d20a3 SHA-256: ef10e48ba09abf53f479965f7e0df0ca82699c309f0c358cd6e841abe14dfa9d
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, suggests a lure related to 'social media apps'. The presence of multiple external URIs indicates an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://baarspo.ru/award?keyword=list+of+social+media+apps+pdf PDF link annotation
    • http://fetesitomer.mygamesonline.org/xajatavozuzeber.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_60199f6663109.pdfIn PDF document text
    • https://zekulosig.weebly.com/uploads/1/3/4/6/134689557/4fb8bd99ae28c.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/what_does_it_mean_when_you_say_ride_the_tiger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_603fb889d7071.pdfIn PDF document text
    • https://cdn.sqhk.co/fonazovep/gedgcih/20906904502.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372105/normal_5fe3d8a9ac4da.pdfIn PDF document text
    • http://cesaregaspari.com/vezimomikutotuocnb.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/1081e5ece3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_603c695fc2f12.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/VjaLig8/launch_fcu_merritt_island_fl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447912/normal_600102c1345b1.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/lspdfr_callouts_fbi.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/d0Egcgi/73758072768.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/gcigWja/gower_bike_ride_2019_road_closures.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/049743ff823778.pdfIn PDF document text
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/xetidopivuzapap-pomalenolorogo-bitonale.pdfIn PDF document text
    • http://hotita.fun/1603226021ntla0.pdfIn PDF document text
    • http://reweder.site/what_is_a_rational_and_an_irrational_numbertclgm.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/dasowamon.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/how_to_cite_a_website_harvard.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/dCroCif/how_to_make_fluffy_slime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d0202bf5-99ee-48de-b442-84b29a20dfe4/angelcare_ac401_alarm_keeps_going_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55baa080-0d86-4487-8018-3f4e7ad099e7/jotuvigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09746b0d-d132-4991-be53-73c891a7d748/mukuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 4828 bytes
SHA-256: c87a4d31798f87de5b3532104a88cfe07ae849ba482129b476c108ac62bfe420
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 10804 bytes
SHA-256: fc67b03bbf38f249519baee1849500637f6f6f3ecf3af44d2c36b62301d9ade9
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361