Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bf26f34758390f…

MALICIOUS

PDF

131.6 KB Created: 2021-04-18 01:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c6ba858feea00a1b641aa16ca226e2a SHA-1: 65b7ef766e490f66558fab2769a10a748f771cbb SHA-256: d2bf26f34758390f9a0e0a8b3fa6864622872a72e5b81f8a4b4402e93a3da049
254 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a malicious redirector link and a PDF link farm. The document contains numerous embedded URLs, many of which point to suspicious domains or are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://yafferge.ru/strik?utm_term=chuang+tzu+butterfly+dream
    • https://xarugowa.weebly.com/uploads/1/3/4/7/134733051/6931564.pdf
    • https://cdn.sqhk.co/tixunudixa/ojhMhay/online_free_throw_basketball_game.pdf
    • https://cdn.sqhk.co/retesixabe/hfBWCNm/real_air_fighter_combat_2018_mod_apk.pdf
    • https://kipusisuvosa.weebly.com/uploads/1/3/1/4/131406826/728520.pdf
    • http://tokio-2020.fun/como_quitar_una_linea_negra_en_la_uaxzkvh.pdf
    • https://cdn.sqhk.co/rebamomidaw/VjcZzhj/jivumavira.pdf
    • https://cdn.sqhk.co/kuluxasoge/GEiivhb/never_have_i_ever_questions_18_tagalog.pdf
    • https://cdn.sqhk.co/nigudovowa/zDUPjdq/77540649243.pdf
    • https://cdn.sqhk.co/megopofe/jhZheBQ/cat_runny_stools_blood.pdf
    • https://cdn.sqhk.co/jelivapizivo/fJSLNjh/lineage_maui_tripadvisor.pdf
    • http://testrun.ru/3290372999vb2oy.pdf
    • https://cdn.sqhk.co/wamitavixitu/gjq6sic/watch_hulu_with_friends_online.pdf
    • https://cdn.sqhk.co/wemulekojex/vgigmjb/vimababanusivawosujuzala.pdf
    • https://cdn.sqhk.co/nawakema/hjdIiaq/pdf_maker_apk_app_free_download.pdf
    • https://bogibopedazite.weebly.com/uploads/1/3/4/0/134018154/suzasujajeje.pdf
    • https://cdn.sqhk.co/ruzixije/ihjhjed/maze_runner_monster_song.pdf
    • http://lnstagram-support.live/what_do_insurance_adjusters_use_to_value_carsdc54g.pdf
    • http://ogranicbio.fun/sub_zero_refrig_and_freezer5sas4.pdf
    • https://cdn.sqhk.co/burexewejam/Rjfiigc/piano_lessons_near_me_cost.pdf
    • https://cdn.sqhk.co/kuzetuzame/tVZmifg/goxolabixoze.pdf
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/javulidizil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rekobive.epizy.com/abandono_idoso.pdf
    • http://pikazunelovo.epizy.com/tonuloroxenalikifepo.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_off0001881b.bin
08849f7690e6b3805b2511c9a1f15cb37b20c12532e8707f0c80fd40567e03f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1881B 11900 bytes
font_01_sfnt_off0001af22.bin
ff31965957d969f90c4614080e9b81c17ea963c2a5b6a54239aba3ac6d098cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF22 5340 bytes
font_02_sfnt_off0001c12f.bin
d8554df920dc7b9cbc4ce8a96799c13136e9f24a5f67e88edf3de7db2c2fe8e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C12F 12496 bytes
font_03_sfnt_off0001e9d1.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9D1 16060 bytes

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