Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87f78f5a9f57aab…

MALICIOUS

PDF

76.8 KB Created: 2021-03-07 14:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 535b26a1c3c0fd8f7b6638d08869bcc6 SHA-1: 0e2ad930c502056c3d2d61910a52099091d53ecc SHA-256: a87f78f5a9f57aab014f75af3088a38fd70db71178d4f3386b900732225131c8
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that appears to be a search result for downloading a game, suggesting a lure for users to download malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URI indicate a likely attempt at malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=download+modern+combat+5+apk+%252B+obb+offline
    • https://static.s123-cdn-static.com/uploads/4371543/normal_5fdf382f32310.pdf
    • http://lunesygets.xyz/masinekugafipukfu24.pdf
    • http://xitodefigatefuj.medianewsonline.com/mupanadutujopavisoji.pdf
    • https://cdn.sqhk.co/rufosopufu/6sKzif6/7301437006.pdf
    • https://cdn-cms.f-static.net/uploads/4446784/normal_5fda1dc983c30.pdf
    • https://cdn-cms.f-static.net/uploads/4388165/normal_60260699f014a.pdf
    • http://yourdesk.website/hunger_games_mockingjay_part_1_credits_songh8p4n.pdf
    • https://static.s123-cdn-static.com/uploads/4372982/normal_5fcea6c028936.pdf
    • http://sadinexiwa.mygamesonline.org/psychology_100_final_exam_answers.pdf
    • https://cdn.sqhk.co/nezusoxe/cib2hca/73467742992.pdf
    • http://itagreen.fun/446624159446538n.pdf
    • https://cdn.sqhk.co/kapopuvida/if7o2hg/37682655671.pdf
    • http://new-volosi.ru/asuran_dhanush_bgm_songsorm8b.pdf
    • https://cdn-cms.f-static.net/uploads/4413474/normal_601ffec8debcd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e122df02-3f4a-4b22-84b8-47252711443b/36782385154.pdf
    • https://uploads.strikinglycdn.com/files/fc483fed-11b5-4eb8-98c1-32983fafc175/how_much_do_long_haired_dachshund_puppies_cost_chino_hills.pdf
    • https://s3.amazonaws.com/dezajok/35413857405.pdf
    • https://s3.amazonaws.com/rowubunak/4007940500.pdf
    • https://uploads.strikinglycdn.com/files/799eee22-4954-46e5-8b64-393147cbe94c/how_to_read_notes_while_on_zoom.pdf
    • https://s3.amazonaws.com/dinigugaxej/jotun_barrier_80_data_sheet.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6b.bin
8b443e58521c2755579e141cafaa419cbb754104868a6d98bf6ad059ac5f10d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 5544 bytes
font_01_sfnt_off0001014d.bin
a3694b35e451084fbb753d38c2c0c749cd38bd51a9fea78861ad106f284e6123
pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 10728 bytes